Do not use arcfour-hmac-md5 when discovering the salt
Since the arcfour-hmac-md5 encryption types does not use salts it cannot be used to discover the right salt.
Related to https://bugzilla.redhat.com/show_bug.cgi?id=1683745
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
Since the arcfour-hmac-md5 encryption types does not use salts it cannot be used to discover the right salt.
Related to https://bugzilla.redhat.com/show_bug.cgi?id=1683745