Support 8192-bit RSA keys in default cert profile
    
    Update the caIPAserviceCert profile to accept 8192-bit RSA keys.
    Affects new installs only, because there is not yet a facility to
    update included profiles.
    
    Fixes: https://pagure.io/freeipa/issue/6319
    Reviewed-By: Tomas Krizek <tkrizek@redhat.com>