Start minion and master configuration with their respective defaults.
Fail as soon as we realize we're deploying and master was not specified anywhere in the configuration.
Fix `KeyError` and don't forget the cloud configuration.

Use any `minion` settings defined in the cloud configuration file if not defined in the VM's configuration.
Minor import call move.
Merge pull request #461 from s0undt3ch/hotfix/fail-soon-when-no-master-is-set

Fail soon when no master is set