Allow using/checking inbound-archive for re-queuing older builds

[Nephyrin]

http://inbound-archive.pub.build.mozilla.org/pub/mozilla.org/

Has a full cycle of inbound builds, though it is not always as up to date as the main FTP. When re-queuing old builds on the status interface, we should be able to go back as many as six months by checking there as a backup.