Bug 1202649

+++ This bug was initially created as a clone of Bug #1201712 +++

Description of problem:
=======================

If a brick is offline there is a transition from changelog to xsync since changelogs can not be captured, once the brick is brough online the xsync continuous to be active and doesnt trasition to changelog:

[2015-03-13 19:20:52.923316] E [repce(agent):117:worker] <top>: call failed: 
Traceback (most recent call last):
  File "/usr/libexec/glusterfs/python/syncdaemon/repce.py", line 113, in worker
    res = getattr(self.obj, rmeth)(*in_data[2:])
  File "/usr/libexec/glusterfs/python/syncdaemon/changelogagent.py", line 41, in scan
    return Changes.cl_scan()
  File "/usr/libexec/glusterfs/python/syncdaemon/libgfchangelog.py", line 45, in cl_scan
    cls.raise_changelog_err()
  File "/usr/libexec/glusterfs/python/syncdaemon/libgfchangelog.py", line 27, in raise_changelog_err
    raise ChangelogException(errn, os.strerror(errn))
ChangelogException: [Errno 111] Connection refused
[2015-03-13 19:20:52.924300] E [repce(/rhs/brick1/b1):207:__call__] RepceClient: call 28276:140684070041344:1426254652.92 (scan) failed on peer with ChangelogException
[2015-03-13 19:20:52.924525] I [resource(/rhs/brick1/b1):1352:service_loop] GLUSTER: Changelog crawl failed, fallback to xsync

Steps carried:
==============

1. Create a master volume (2x3) from 3 nodes N1,N2,N3 consisting 2 bricks each.
2. Start the master volume
3. Create a slave volume (2x2) from 2 nodes S1,S2
4. Start a slave volume
5. Mount the master volume to the client
6. Create and start the georep session between master and slave
7. Copy the huge set of data from the client on master volume
8. While the data is in progress, bring bricks offline and online from node N1 and N2. Ensured that not to bring bricks offline from node N3 keeping one brick constant up in x3 replica.
9. After sometime when all bricks are online, check the geo-rep status and logs

Actual results:
==============

georep status is shown as hybrid and logs shows that it failed to transition to changelog and fallsback to xsync