Disable logger validation during unit testing
Disable logger validation during unit testing

The unit tests set format to "dummy", which gets rejected by Python 3.8
by default due to newly added validation here:

  https://github.com/python/cpython/commit/18fb1fb943b7dbd7f8a76017ee2a67ef13effb85

We can skip this and restore old behavior by disabling validation.

Change-Id: I22ba9c4437787c3f338f17a0b006132b0dd09df5

openstack/oslo.privsep