Support for http and non-standard ports

[pyhedgehog]

1. If one starts gitlab (or i.e. gogs) on localhost there are no need for SSL in transfer.
2. Locally started service can be listening on ports other that 80/443 and 22 for ssh. I.e. gogs by default listens on 3000.

There are several places (at least repo.py:178 where assumed https.

[guyzmo]

Yup, you're right, I shouldn't have assumed https only per default.

I only introduced recently insecure (i.e. self signed) certificate supports, and it's quite likely that specifiying non-standard ports might break URL lookup. Though there really is only two places where https is assumed, and one of those two where a change is really needed by a PR fixing this issue:

• it's _guess_repo_slug(), I guess there you could check a service.protocol that would contain https, the same way you can check for service.name etc… That would be doing a proper decoupling of the protocol the same way I've been doing with the other elements.

The other place is:

• in url_ro which can be overloaded when subclassing the class RepositoryService, so it's less an issue. But still a good idea to keep in coherence with the change I'm suggesting above.

Otherwise, that shouldn't impact the tests, and neither should it impact implementation of the other services.