update smart_proxy_salt to 0.0.2

```/etc/salt/foreman.yaml.example``` and ```/usr/bin/foreman-node``` are requirements by @stbenjam

I think the gem install will install two things into the build root:

1. %{gem_instdir}/bin/foreman-node, which will be copied by the cp -pa on line 57 already
2. a bin "stub" at %{_bindir}/foreman-node which you should copy here instead

You should copy both, not copy the gem inst version to /usr/bin, if that makes sense.  If it doesn't generate the latter, you may need to add --bindir to the gem install, but I think it should be there already.