Nothing is going to extract these strings for translations. 

Unsure of how to fix that.

https://github.com/candlepin/subscription-manager/pull/820  setups up some stuff to handle exceptions that need translated messages.

For the ServerUrlParse stuff, we actually only show the exception msg in a few cases (cli, and the migrate cli code). 

Maybe easier to ditch the useful, detailed errmsgs and just show a "invalid url" (that string would be in subman and translated) or whatever for those cases. Sigh.