Add the 'certprofile' plugin which defines the commands for managing
certificate profiles and associated permissions.
Also update Dogtag network code in 'ipapython.dogtag' to support
headers and arbitrary request bodies, to facilitate use of the
Dogtag profiles REST API.
Part of: https://fedorahosted.org/freeipa/ticket/57
Reviewed-By: Martin Basti <mbasti@redhat.com>
