Fix streaming NOT working with port != 80

Note that "NOT working" means "it didn't work". I mean "really didn't work".

This is not the same error as
- streamproxy bypassing the login although stream auth is enabled
or the opposite
- streamproxy asking for login while stream auth is disabled.

The third person reporting an unwanted login query as "doesn't work" gets shot ... and two have already been there ...
Backport oe-a fixes
Merge remote-tracking branch 'e2openplugins/master' into branding