6772: Set submit argument of -proxy to proxy_url value in factory
6772: Set submit argument of -proxy to proxy_url value in factory

We need to pass in the proxy_url setting to the arguments for glidein
submission with the -proxy argument. (It needs to be a submit
argument because the bootstrap script should use it to pull down
everything.) This has been busted since v3.0.

bbockelm/glideinWMS,bbockelm/glideinWMS,bbockelm/glideinWMS,bbockelm/glideinWMS