georep: python2 to python3 compat - scheduler

1. scheduler - Popen
2. syncdutils - corner case on failure

fixes: bz#1643932
Change-Id: I65af97a244a8790e976acedc2728db6ebbf2ae10
Signed-off-by: Kotresh HR <khiremat@redhat.com>

extras/geo-rep/schedule_georep.py.in

@@ -83,7 +83,7 @@ def execute(cmd, success_msg="", failure_msg="", exitcode=-1):
     On success it can print message in stdout if specified.
     On failure, exits after writing to stderr.
     """
-    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)
     out, err = p.communicate()
     if p.returncode == 0:
         if success_msg:

geo-replication/syncdaemon/syncdutils.py

@@ -847,7 +847,7 @@ class Popen(subprocess.Popen):
                 break
             b = os.read(self.stderr.fileno(), 1024)
             if b:
-                elines.append(b)
+                elines.append(b.decode())
             else:
                 break
         self.stderr.close()