Release smart_proxy_salt 1.0.0 (DEB)

> salt-master should already handle the dependency on python.

Indeed, over in the RPM package @domcleal recommended to explicitly state the dependency, since we include some actual python - not sure if the same applies to deb?

>  Is smart-proxy 1.7 really required now?

Hmm, not strictly, although there's zero new functionality without it and I wanted to be consistent with the version mapping between foreman versions I guess.