SERVER-3748 Update Red Hat RPM packaging to include config server and mongos as options

These changes are to support using the standard RPM packages when deploying a sharded cluster. It includes packages for the config server, mongos and an improved standard server package.

Please see discussion: http://groups.google.com/group/mongodb-user/browse_thread/thread/e174a5f04f5d8e1c

Per Jira ticket https://jira.mongodb.org/browse/SERVER-3748

We are running these changes in production. Please let me know if we need to make any changes and we can test them prior to re-submitting.

Thank you
Reid Morrison