Deploy Salt Tower on salt-primary role
Summary:
Software and Salt configuration needed by D2862 refactoring.
See this change for the context and rationale.
Ref T1768.
Test Plan: Deploy and test D2862 change
Reviewers: dereckson
Reviewed By: dereckson
Maniphest Tasks: T1768
Differential Revision: https://devcentral.nasqueron.org/D2869