If the app is restarted with a custom provider selected, the client can
request a log in without certificates problems.

I've removed the addition of the certificate when downloaded
eip-service.json, because I already do that in LeapHttpClient.

Solves issue 2367: https://leap.se/code/issues/2367
Logging in successfully to dev.bitmask.net :)

The problem was that I needed to append the api_version to the api_uri.
I was doing well in tests because I hardcoded the api urls, but in
production code I was getting from provider.json only api_url and not
api_version.