cluster/afr: Set pending changelog based on filetype for new entries

Change-Id: Ib6eea2dfe43aacf1f3446cc023adecbcf8645d48
BUG: 1132102
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/8506
Reviewed-by: Anuradha Talur <atalur@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>