Adapt redhat ipaplatform to RHEL9/ELN
On RHEL8, ipa is using named-pkcs11.service but RHEL9 is based on
fedora34 and uses named.service instead. There is already some support
for this distinction in ipaplatform, and the patch relies on the
specific settings that can be configured in ipaplatform/xx/services.py
and ipaplatform/xx/constants.py
On RHEL9 ipa also needs to define NAMED_OPENSSL_ENGINE for named
to use openssl's okcs11 engine.
Fixes: https://pagure.io/freeipa/issue/8753
Reviewed-By: Rob Crittenden <rcritten@redhat.com>