semanage inconsistency

[Dominick Grift]

I was able to remove a user mapping while there was a login mapping to
that user

That caused issues because then i later was not able to remove the login
mapping because the seuser did not exist.

I have to eventually manually edit the various seuser files
in /etc/selinux && semodule -B to undo the mess.

Also on a somewhat unrelated note:

if you add a user with useradd -Z and then later delete the user then
the mapping is still left behind without any warnings