Revert "Initial import of "slot" system (#3136)"

This reverts commit 6e1816e30cfd742a99507f96e0742942e67687b8.

Conflicts:

	salt/modules/slot.py
	salt/utils/slot.py
Revert "Slight docs update"

This reverts commit 795e84ec411aff3fab547a57ffcf7d5a885b4ce4.
Revert "Removing debug print statement"

This reverts commit b4d1c6ecce4f542bb2b8788b97a0a2c886fa8df8.