Fixes for Red-Hat Family

These corrections can install Rundeck on centos or rhel OS.
Among the corrections are rundeck vhost settings and disable default site of apache.
Disable gpgcheck in yum repo ,since the rpm is not signed.
And finally I disable selinux for the mod_proxy can run.

Run in kitchen with ubuntu 14.04 and there were no errors.

Sorry for my English.
Best Regards