[TRIVIAL] Properly build ws url
[TRIVIAL] Properly build ws url

Location object omits port when its a default. In such case
don't include it in the assembled URL.

R=jeff.pihach
CC=
https://codereview.appspot.com/7522044

jrwren/juju-gui,CanonicalJS/juju-gui,mitechie/juju-gui,jrwren/juju-gui,mitechie/juju-gui,bac/juju-gui,mitechie/juju-gui,mitechie/juju-gui,jrwren/juju-gui,bac/juju-gui,bac/juju-gui,CanonicalJS/juju-gui,CanonicalJS/juju-gui,bac/juju-gui,jrwren/juju-gui