Add client side support to set allowed enctypes
When using remote credentials, intercept set_cred_option calls and
register an option into the existing set of crdentials with the
request to set allowed entypes at the first use of said crdentials.
Signed-off-by: Simo Sorce <simo@redhat.com>
Reviewed-by: Günther Deschner <gdeschner@redhat.com>