Added apis to scenario manager

Tempest plugins do use associate_floating_ip() and
disassociate_floating_ip() api but scenario-
manager doesn't implement it.
The plugins using these apis are manila-tempest-
plugin, tap, vmware-nsx and neutron-tempest-plugin.
Hence, added it to the scenario manager

Implements: blueprint tempest-scenario-manager-stable
Signed-off by: Soniya Vyas<svyas@redhat.com>
Change-Id: I41792bdc3478f5f290a6b3b7172ef3f6b4c62c19
2 files changed