Fix comparison of operatingsystemrelease for CentOS 7.0.1406

Changes:
* Fix comparison of operatingsystemrelease for CentOS 7.0.1406
* Move spec/spec.opts to .rspec to support RSpec >= 2.0 option file method

Error received without this change (also observed with unit test changes without change to params.pp):

```
Error: Could not retrieve catalog from remote server: Error 400 on SERVER: comparison of String with 6 failed at /etc/puppet/environments/production/modules/foreman_proxy/manifests/params.pp:40 on node puppetmaster02.<DOMAIN>
```

```
# facter operatingsystemrelease
7.0.1406
```