Remove salt FreeBSD repo which is now 2 years out of date
Remove salt FreeBSD repo which is now 2 years out of date

The saltstack repository has the 2016 version is current. Its not being updated, but there is a perfectly good port in the FreeBSD tree to use instead. Enhance the documentation on how to install that from binary or source.
saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt