geo-rep: fix same file different gfid in master and slave

While processing RENAME in changelog, if the file is unlinked
in master, then geo-rep was sending UNLINK to slave instead of
RENAME.

If rsync job fails if one of the file failed to sync in the job.
This patch adds logic to remove GFID from data list if the same
changelog has UNLINK entry for it after the DATA. Or it removes
those GFIDs during retry of changelogs processing.

BUG: 1143853
Change-Id: I982dc976397cd0ab676bb912583f66a28f821926
Signed-off-by: Aravinda VK <avishwan@redhat.com>
Reviewed-on: http://review.gluster.org/8761
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
Reviewed-by: Kotresh HR <khiremat@redhat.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>
Tested-by: Venky Shankar <vshankar@redhat.com>