geo-rep: Sync atime, mtime to slave when SETATTR

Existing geo-rep only syncs chown and chmod, with this
patch geo-rep also syncs atime and mtime.

Change-Id: Iea52d86682873bb4a47eeb0d325f5b9ddf2de2cf
Signed-off-by: Aravinda VK <avishwan@redhat.com>
BUG: 1176934
Reviewed-on: http://review.gluster.org/9331
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>