Remove create_floating_ip & get_server_ip methods

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

Barbican tempest plugin still uses nova-network old interface for floating ip related methods, this patch removes them and use tempests's ones which already use neutron's interface.[2]

Replaced methods:
	* create_floating_ip
	* get_server_ip

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://opendev.org/openstack/tempest/commit/6428139de18291c916852ae48130fb8a7b4db318

Change-Id: I7b048f78d0ee8fd2aae33134caa1a8034fa31031
1 file changed