Fixes integration testing issues with CentOS 6.6 and upstart.
Fixes integration testing issues with CentOS 6.6 and upstart.

In all of RedHat's infinite wisdom it seems that upstart is available on
EL6.6. The poise-service library cookbook we use defaults to that so we
need to conver that test case in our integration tests.

johnbellone/consul-cookbook,johnbellone/consul-cookbook,johnbellone/consul-cookbook