This migrates the above files from tempest.
This includes tempest commits:
* floating_ips_client.py: Ib7886438228f31142dd23d9ca3205e7d2b434c92
* test_floating_ips_client.py: Ibbb6439d31f5379bcb5e92e8bf49bcab9ad51a0f
to see the commit history for these files refer to the above Change-Ids
in the tempest repository.
Partially implements blueprint migrate-service-clients-to-tempest-lib
Change-Id: Ide46dfbd437707c376bb44f86c99a87b739b9ef0