[FEATURE REQUEST] Access regular mine in Salt-SSH

[lkubb]

Is your feature request related to a problem? Please describe.
Currently, the mine.get wrapper module can only fetch returns from minions defined in the roster. Since salt-ssh is effectively initiated from the master node, it is trivial to allow accessing the regular mine from the wrapper.

Describe the solution you'd like
Add a switch to the mine.get SSH wrapper: ssh_minions and regular_minions, which define from where to fetch the data.

Describe alternatives you've considered
Using the pillar to pass data from the regular mine - this will work soon because related issues have been fixed.

Additional context
PR incoming.