The PKI JSON API the revocation reason key may be case-sensitive
    
    PKI 11.4.0 changed the reason keyword in the REST API from lower-case
    to camel-case in https://github.com/dogtagpki/pki/commit/926eb221ce6
    
    Use Reason instead of reason as the keyword for revocations
    for PKI 11.4.0+
    
    Related: https://pagure.io/freeipa/issue/9345
    
    Signed-off-by: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Thomas Woerner <twoerner@redhat.com>