M$ SCVMM in mgmt_system

Working on it, seems it will be quite easy to do it. There is just only one big drawback - pywinrm cannot make domain user login with simple auth so it has to be done inside of the script which seems to be tremendously slow.
Everything down at the bottom here should not be in the mgmt_system namespace. The functions should either be methods or staticmethods on `SCVMMSystem`.