Rewrite stein jobs using tempest_exclude_regex

As detailed in [0], these jobs can not use the parent master definition
anymore, as tempest_exclude_regex should not be set (and legacy
tempest_black_regex used instead).

This integrates the master job definition directly, with that variable
name change (and will be tested on a separate stein backport to confirm
stein gates actually pass with it)

[0] https://review.opendev.org/c/openstack/neutron-tempest-plugin/+/786657

Change-Id: I1f93d8ce3b9708ebcdd4408675012229964af032
Closes-Bug: #1923412
1 file changed