[fwaas] Remove _log_console_output & ping_ip_address

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

Removed methods:
    * _log_console_output
    * ping_ip_address

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: I35a0682ce5d92660c55aca86249684e492112dc5
1 file changed