cert: add revocation reason back to cert-find output
    
    In commit c718ef058847bb39e78236e8af0ad69ac961bbcf some param values were
    accidentally removed from cert-find output.
    
    In commit 22d5f579bbd8bb452cf1bf620294ab6ade6e7c47 `serial_number_hex` and
    `revoked` were added back.
    
    Add back `revocation_reason` as well. Also, do not include `revoked` with
    --raw, as it's a virtual attribute.
    
    https://fedorahosted.org/freeipa/ticket/6269
    
    Reviewed-By: Pavel Vomacka <pvomacka@redhat.com>