Description of problem:

https://github.com/freeipa/freeipa/blob/beb6d74b81eae9965ddc031db1a3826c01d59d3
0/ipaserver/plugins/selinuxusermap.py#L104

The above code seems to do some "sanity" checks that forces one to use selinux
user identities with only "aZ" and "_"

The CIL selinux policy language leverages "name spaces" so would be nice if we
can use that.

Example:

unconfined_u would be unconfined.u

Do we need these sanity checks at all though? I would explect that libsemanage
takes care of this for us?

The mls checks also seem to assume that one has no more than 15 sensitivities.
There is no hard limit to 15 in practice.