Remove _check_tenant_network_connectivity & _update_router_admin_state methods

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

Replaced methods:
	* _check_tenant_network_connectivity (not used)
	* _update_router_admin_state (not used)

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: Iea47467e3c8849981d4ed3bd9dc61834031d7be0
1 file changed