cluster/afr : Mark pending changelog xattrs for new creations

Based on type of file, set appropriate pending changelogs
for new entries.

Change-Id: Ifd124bf9bc54b996ce83ab9f39d03b3ccca7eb3c
BUG: 1130892
Signed-off-by: Anuradha <atalur@redhat.com>
Reviewed-on: http://review.gluster.org/8555
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Tested-by: Pranith Kumar Karampuri <pkarampu@redhat.com>