core/various: python3 compat, prepare for python2 -> python3

see https://review.gluster.org/#/c/19788/,
    https://review.gluster.org/#/c/19871/, and
    https://review.gluster.org/#/c/19952/

This patch adds version agnostic imports for urllib, cpickle,
socketserver, _thread, queue, etc., suggested by Aravinda in
https://review.gluster.org/#/c/19767/1

Note: Fedora packaging guidelines require explicit shebangs, so
popular practices like #!/usr/bin/env python and #!/usr/bin/python
are not allowed; they must be #!/usr/bin/python2 or #!/usr/bin/python3

Note: Selected small fixes from 2to3 utility. Specifically apply,
basestring, funcattrs, idioms, numliterals, set_literal, types, urllib,
and zip have already been applied.

Note: these 2to3 fixes report no changes are necessary: exec, execfile,
exitfunc, filter, getcwdu, intern, itertools, metaclass, methodattrs, ne,
next, nonzero, operator, paren, raw_input, reduce, reload, renames, repr,
standarderror, sys_exc, throw, tuple_params, xreadlines.

Change-Id: I8d393064a1837874d8b4bc87c8ce05c679664642
updates: #411
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>

events/src/glustereventsd.py

@@ -13,7 +13,10 @@
 from __future__ import print_function
 import sys
 import signal
-import SocketServer
+try:
+    import socketserver
+except ImportError:
+    import SocketServer as socketserver
 import socket
 from argparse import ArgumentParser, RawDescriptionHelpFormatter
 

events/src/utils.py

@@ -16,7 +16,10 @@ import fcntl
 from errno import EBADF
 from threading import Thread
 import multiprocessing
-from Queue import Queue
+try:
+    from queue import Queue
+except ImportError:
+    from Queue import Queue
 from datetime import datetime, timedelta
 import base64
 import hmac

geo-replication/syncdaemon/argsupgrade.py

@@ -1,3 +1,13 @@
+# -*- coding: utf-8 -*-
+#
+#  Copyright (c) 2016 Red Hat, Inc. <http://www.redhat.com>
+#  This file is part of GlusterFS.
+#
+#  This file is licensed to you under your choice of the GNU Lesser
+#  General Public License, version 3 or any later version (LGPLv3 or
+#  later), or the GNU General Public License, version 2 (GPLv2), in all
+#  cases as published by the Free Software Foundation.
+#
 # Converts old style args into new style args
 
 from __future__ import print_function

geo-replication/syncdaemon/gsyncd.py

@@ -1,4 +1,15 @@
 #!/usr/bin/python2
+# -*- coding: utf-8 -*-
+#
+#  Copyright (c) 2016 Red Hat, Inc. <http://www.redhat.com>
+#  This file is part of GlusterFS.
+#
+#  This file is licensed to you under your choice of the GNU Lesser
+#  General Public License, version 3 or any later version (LGPLv3 or
+#  later), or the GNU General Public License, version 2 (GPLv2), in all
+#  cases as published by the Free Software Foundation.
+#
+
 from argparse import ArgumentParser
 import time
 import os

geo-replication/syncdaemon/gsyncdconfig.py

@@ -1,4 +1,18 @@
-from ConfigParser import ConfigParser, NoSectionError
+# -*- coding: utf-8 -*-
+#
+#  Copyright (c) 2016 Red Hat, Inc. <http://www.redhat.com>
+#  This file is part of GlusterFS.
+#
+#  This file is licensed to you under your choice of the GNU Lesser
+#  General Public License, version 3 or any later version (LGPLv3 or
+#  later), or the GNU General Public License, version 2 (GPLv2), in all
+#  cases as published by the Free Software Foundation.
+#
+
+try:
+    from configparser import ConfigParser, NoSectionError
+except ImportError:
+    from ConfigParser import ConfigParser, NoSectionError
 import os
 from string import Template
 from datetime import datetime

geo-replication/syncdaemon/gsyncdstatus.py

@@ -13,7 +13,10 @@ from __future__ import print_function
 import fcntl
 import os
 import tempfile
-import urllib
+try:
+    import urllib.parse as urllib
+except ImportError:
+    import urllib
 import json
 import time
 from datetime import datetime

geo-replication/syncdaemon/logutils.py

@@ -1,3 +1,14 @@
+# -*- coding: utf-8 -*-
+#
+#  Copyright (c) 2016 Red Hat, Inc. <http://www.redhat.com>
+#  This file is part of GlusterFS.
+#
+#  This file is licensed to you under your choice of the GNU Lesser
+#  General Public License, version 3 or any later version (LGPLv3 or
+#  later), or the GNU General Public License, version 2 (GPLv2), in all
+#  cases as published by the Free Software Foundation.
+#
+
 import logging
 from logging import Logger, handlers
 import sys

geo-replication/syncdaemon/repce.py

@@ -13,9 +13,18 @@ import sys
 import time
 import logging
 from threading import Condition
-import thread
-from Queue import Queue
-import cPickle as pickle
+try:
+    import _thread
+except ImportError:
+    import thread as _thread
+try:
+    from queue import Queue
+except ImportError:
+    from Queue import Queue
+try:
+    import cPickle as pickle
+except ImportError:
+    import pickle
 
 from syncdutils import Thread, select, lf
 

geo-replication/syncdaemon/subcmds.py

@@ -1,3 +1,13 @@
+# -*- coding: utf-8 -*-
+#
+#  Copyright (c) 2016 Red Hat, Inc. <http://www.redhat.com>
+#  This file is part of GlusterFS.
+#
+#  This file is licensed to you under your choice of the GNU Lesser
+#  General Public License, version 3 or any later version (LGPLv3 or
+#  later), or the GNU General Public License, version 2 (GPLv2), in all
+#  cases as published by the Free Software Foundation.
+#
 
 from __future__ import print_function
 from syncdutils import lf

geo-replication/syncdaemon/syncdutils.py

@@ -28,7 +28,10 @@ import select as oselect
 from os import waitpid as owaitpid
 import xml.etree.ElementTree as XET
 from select import error as SelectError
-from cPickle import PickleError
+try:
+    from cPickle import PickleError
+except ImportError:
+    from pickle import PickleError
 
 from conf import GLUSTERFS_LIBEXECDIR, UUID_FILE
 sys.path.insert(1, GLUSTERFS_LIBEXECDIR)

tools/glusterfind/src/brickfind.py

@@ -13,7 +13,10 @@ import os
 import sys
 import logging
 from argparse import ArgumentParser, RawDescriptionHelpFormatter
-import urllib.request, urllib.parse, urllib.error
+try:
+    import urllib.parse as urllib
+except ImportError:
+    import urllib
 import time
 
 from utils import mkdirp, setup_logger, create_file, output_write, find

tools/glusterfind/src/changelog.py

@@ -16,7 +16,10 @@ import xattr
 import logging
 from argparse import ArgumentParser, RawDescriptionHelpFormatter
 import hashlib
-import urllib.request, urllib.parse, urllib.error
+try:
+    import urllib.parse as urllib
+except ImportError:
+    import urllib
 import codecs
 
 import libgfchangelog

tools/glusterfind/src/conf.py

@@ -9,7 +9,10 @@
 # cases as published by the Free Software Foundation.
 
 import os
-import ConfigParser
+try:
+    import configparser
+except ImportError:
+    import ConfigParser as configparser
 
 config = ConfigParser.ConfigParser()
 config.read(os.path.join(os.path.dirname(os.path.abspath(__file__)),

tools/glusterfind/src/nodeagent.py

@@ -14,7 +14,10 @@ import sys
 import os
 import logging
 from argparse import ArgumentParser, RawDescriptionHelpFormatter
-import urllib.request, urllib.parse, urllib.error
+try:
+    import urllib.parse as urllib
+except ImportError:
+    import urllib
 from errno import ENOTEMPTY
 
 from utils import setup_logger, mkdirp, handle_rm_error