osx: LaunchDaemon plist filename should start with org instead of com

Change-Id: I5e06bcc473224667387c555355d7e1e81bf4911b
BUG: 1141659
Reviewed-on: http://review.gluster.org/8734
Reviewed-by: Harshavardhana <harsha@harshavardhana.net>
Tested-by: Harshavardhana <harsha@harshavardhana.net>
Tested-by: Gluster Build System <jenkins@build.gluster.com>