python: remove shebangs of non-main scripts and make others executable

Some of the scripts that have a #!/usr/bin/python3 shebang do not have a
main() like function. These scripts will not get executed but only
imported. They do not need the shebang.

A few others are not installed with 'make install', but do have a main()
like function. These scripts are expected to be used by developers for
different tasks (mostly code generation). Marking these scripts
executable to make it easier to identify them.

Change-Id: I73541471deb7e0830766b804786244e73dfe4221
Updates: #411
Signed-off-by: Niels de Vos <ndevos@redhat.com>

events/src/gf_event.py

@@ -1,4 +1,3 @@
-#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 #
 #  Copyright (c) 2016 Red Hat, Inc. <http://www.redhat.com>

extras/snap_scheduler/conf.py.in

@@ -1,4 +1,3 @@
-#!/usr/bin/python3
 #
 # Copyright (c) 2016 Red Hat, Inc. <http://www.redhat.com>
 # This file is part of GlusterFS.

geo-replication/syncdaemon/conf.py.in

@@ -1,4 +1,3 @@
-#!/usr/bin/python3
 #
 # Copyright (c) 2016 Red Hat, Inc. <http://www.redhat.com>
 # This file is part of GlusterFS.

geo-replication/tests/__init__.py

@@ -1,4 +1,3 @@
-#!/usr/bin/python3
 #
 # Copyright (c) 2011-2014 Red Hat, Inc. <http://www.redhat.com>
 # This file is part of GlusterFS.

geo-replication/tests/unit/__init__.py

@@ -1,4 +1,3 @@
-#!/usr/bin/python3
 #
 # Copyright (c) 2011-2014 Red Hat, Inc. <http://www.redhat.com>
 # This file is part of GlusterFS.

geo-replication/tests/unit/test_syncdutils.py

@@ -1,4 +1,3 @@
-#!/usr/bin/python3
 #
 # Copyright (c) 2011-2014 Red Hat, Inc. <http://www.redhat.com>
 # This file is part of GlusterFS.

xlators/features/glupy/src/__init__.py.in

@@ -1,4 +1,2 @@
-#!/usr/bin/python3
-
 from pkgutil import extend_path
 __path__ = extend_path(__path__, __name__)