Make _create_loginable_secgroup public

As tempest.scenario.manager was announced stable interface in Tempest 27.0.0[1] it can be now reused in plugins.

_create_loginable_secgroup method isn't ready to be deleted yet, because its rulesets differs from tempest's. This method will be public now, so replaced methods will use this method over the tempest's one. Tempest doesn't allow to modify rulesets, but patch that will allow this is already proposed[2]. Some time after merging the mentioned tempest patch this plugin's implementation will be replaced.

Etherpad concerning this effort:
https://etherpad.opendev.org/p/tempest-scenario-manager-cleanup

[1] https://docs.openstack.org/releasenotes/tempest/v27.0.0.html#release-notes-27-0-0
[2] https://review.opendev.org/c/openstack/tempest/+/835018

Change-Id: I6b61d810c4695ac4709173a69f1b920b7228a1d0
1 file changed