Install salt-wrapper

Summary:
As salt-wrapper doesn't currently have a FreeBSD port
and a Debian RPM available, we deploy this through Salt.

The software has been staged at D1025 / 58cd1698ab28.

Test Plan: Deployed on Ysul, see P257.

Reviewers: Sandlayth

Reviewed By: Sandlayth

Differential Revision: https://devcentral.nasqueron.org/D1026