ClearML Agent allows to force git cloning via SSH and also has a
setting to force a username. The relevant settings are:
agent.force_git_ssh_protocol: true
agent.force_git_ssh_user: "git"
However, forcing a specific username or port only worked so far if the
agent translated either from https->ssh or from ssh->https. A given
ssh URL was not rewritten.
This commit adds a helper function and includes it in `_set_ssh_url`
to allow rewriting ssh URLs with the username and/or port given in the
config `agent.force_git_ssh_user`.
If neither username nor port are forced in the config, the URL is not
touched.
This is somewhat related to issue #42.
Note that rewriting https->https is not covered in this commit.
