geo-rep: Fix rename of directory syncing.

The rename of directories are captured in all distributed
brick changelogs. gsyncd processess these changelogs on
each brick parallellaly. The first changelog to get processed
will be successful. All subsequent ones will stat the 'src'
and if not present, tries to create freshly on slave. It
should be done only for files and not for directories.
Hence when this code path was hit, regular file's blob
is sent as directory's blob and gfid-access translator
was erroring out as 'Invalid blob length' with errno as
'ENOMEM'

Change-Id: I50545b02b98846464876795159d2446340155c82
BUG: 1146823
Signed-off-by: Kotresh HR <khiremat@redhat.com>
Reviewed-on: http://review.gluster.org/8865
Reviewed-by: Aravinda VK <avishwan@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>
Tested-by: Venky Shankar <vshankar@redhat.com>