router: construct url with net.JoinHostPort
router: construct url with net.JoinHostPort

This ensures we construct the host:port correctly in a URL when working
with IPv6 addresses.

openshift/origin,soltysh/origin,mfojtik/origin,hroyrh/origin,mahak/origin,csrwng/origin,bparees/origin,soltysh/origin,openshift/origin,mahak/origin,hroyrh/origin,akram/origin,csrwng/origin,gabemontero/origin,gabemontero/origin,mfojtik/origin,openshift/origin,csrwng/origin,jsafrane/origin,deads2k/origin,deads2k/origin,mfojtik/origin,akram/origin,hroyrh/origin,jsafrane/origin,bparees/origin,jsafrane/origin,sallyom/origin,deads2k/origin,soltysh/origin,mahak/origin,sallyom/origin,bparees/origin,gabemontero/origin,sallyom/origin,akram/origin