[bgpvpn] Remove unused scenario.manager methods

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

Removed methods:
    * create_server
    * check_public_network_connectivity
    * _associate_floating_ip
    * _disassociate_floating_ip
    * check_floating_ip_status
    * _check_tenant_network_connectivity
    * _update_router_admin_state
    * create_networks
    * check_vm_connectivity
    * _get_router
    * ping_ip_address
    * _create_subnet
    * _log_net_info
    * _get_network_by_name

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: Id267ccaaa29ab6ee76bf8789484f1975542d5090
1 file changed