GOMAXPROCS picks number of CPUs using sysconfig - Also updated Serverspec to 2.0

Current server spec installation will use 2.0 - which means i have to
change spec_helper and matchers.

Also consul uses the ui with an extra relative folder consul_ui - that
had to be fixed for server spec to pass
This directory hasn't changed from [the attribute](https://github.com/johnbellone/consul-cookbook/pull/52/files#diff-25e5d4a4446ae12a0d6f1162b6160375R57) has it?