Allow kwargs in create_floating_ip
Allow kwargs in create_floating_ip

As a part of the scenario/manager.py stabilization tracked by
the below BP the patch adds kwargs argument for create_floating_ip
method so that the consumers are able to pass additional parameters
if needed.

Implements: blueprint tempest-scenario-manager-stable
Change-Id: Ia84a65621713d05564f9bf1107fb04f9a9b3314d

openstack/tempest,openstack/tempest