openqa: try and fix on-disk encryption stuff
Some of the openqa workers are encrypted and some aren't (this is a bit of a
mess that's partly a result of all the redeployments we did around
https://bugzilla.redhat.com/show_bug.cgi?id=2009585 ). We should only run
the nbde_client role on workers which are encrypted. Hopefully this gets that
right.
Signed-off-by: Adam Williamson <awilliam@redhat.com>