create_server method full removal

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

There is no need to have create_server definition in ironic scenario manager

Replaced methods:
	* create_server

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

Change-Id: I781cbf90e283bd8a3be4ad3e6aa7c13f280444e0
1 file changed