Apply a few remaining rspec 3.0 fixes

Cherry-picked from PR#223 from jperville
Replace ChefSpec::Runner with ChefSpec::SoloRunner

Addressed the depreceation warning.
Replace define_runner_method with define_matcher

Addressed deprecation warning from ChefSpec
Update stub_command to search for "go1.2"

Addresses error that was causing some tests to fail.
Constrain serverspec version in kitchen tests
Merge PR#224 - Fix runit container template

The current template tries to run two successive lines with exec. But since exec causes the current process to be replaced, the second line is never run. This causes runit to always report that the container service is down and to continually try to restart it.

Just remove the first exec to fix.