glusterd: make 'glusterd_is_local_addr' return bool

Change-Id: Id3bd0bfc4802c166f7a32b0cc6a726aeb5617b5d
BUG: 890618
Signed-off-by: JulesWang <w.jq0722@gmail.com>
Reviewed-on: http://review.gluster.org/4427
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>