Added support for el7 (centos/redhat)

Moved redhat/centos to redhat6/centos6 recipes as that seemed
easier with allt he changes between versions.

Signed-off-by: Sandon Van Ness <sandon@inktank.com>
Add httpd/fastcgi packages on rhel7 hosts.

Signed-off-by: Sandon Van Ness <sandon@inktank.com>