features/changelog: more changelog fixes.

-> log additional records.
-> include FOP number for metadata.
-> prevent crash if inode is not found in a fop.

Change-Id: I9edd4b71819ebd68c6a2b4150ae279c471d129da
BUG: 1036536
Signed-off-by: Ajeet Jha <ajha@redhat.com>
Reviewed-on: http://review.gluster.org/6403
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amarts@gmail.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>