dn: sort AVAs when converting from x509.Name
Equal DNs with multi-valued RDNs can compare inequal if one (or
both) is constructed from a cryptography.x509.Name, because the AVAs
in the multi-valued RDNs are not being sorted.
Sort the AVAs when constructing from Name and add test cases for
equality checks on multi-valued RDNs constructed from inputs with
permuted AVA order.
Part of: https://pagure.io/freeipa/issue/7963
Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>