cloud roster: Check provider and profile configs for ssh_username
cloud roster: Check provider and profile configs for ssh_username

Pass the vm_ variable with provider and profile info to
salt.utils.cloud.ssh_usernames in order to lookup ssh_username not only
in the main salt-cloud config file but in provider and profile
configuration as well. It is the same way all other settings are
retrieved in the cloud roster.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt