geo-rep/libgfchangelog: Support of symlinks while creation of working dir.

In gf_changelog_register, enable symlink support while creating
working directory if its not already created.

Change-Id: I4b81762d04f5276a65087d2ff94f2a36dc504b58
BUG: 1125843
Signed-off-by: Kotresh H R <khiremat@redhat.com>
Reviewed-on: http://review.gluster.org/8409
Reviewed-by: Venky Shankar <vshankar@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Tested-by: Venky Shankar <vshankar@redhat.com>