[fwaas] Remove unused methods

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

Removed methods:
    * check_public_network_connectivity
    * _associate_floating_ip
    * _disassociate_floating_ip
    * check_floating_ip_status
    * _check_tenant_network_connectivity
    * _update_router_admin_state
    * create_networks
    * _log_net_info
    * _get_network_by_name
    * _check_remote_connectivity
    * _get_router

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: Iaf336377dc003ecb0e7f5d1f2d825261e8da0c4a
1 file changed