Server affinity: call ca.install() if there is a CA in the topology
    
    This should not have been gated on options.setup_ca because we need
    the RA agent on all servers if there is a CA in the topology otherwise
    the non-CA servers won't be able to communicate with the CA.
    
    Fixes: https://pagure.io/freeipa/issue/9510
    
    Signed-off-by: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>