Improve logging for http/tmc remote repo

[enricoschuetz]

If I use the Tmc CLI with a configured remote http or tmc repo, currently there are no log outputs if something
fails in the remote repo itself.
E.g. if the remote repo returns an 401 error "unauthorized".

As a user, it would be helpful to have this information as log output.

Hint:
I guess the place to implement would be http_base.go, func (b *baseHttpRepo) doHttp(req *http.Request)