This migrates the above files from tempest. This includes tempest commits:
* hypervisor_client.py : Icf782e4469fcecba773b3187c1b36d9d49829c93
* test_hypervisor_client.py: I401057ecdf70d693c285cdaf64e1a5db62fc9b17
* hypervisors.py : I64883306235dc3b90a3a878674532f77d825d5c4
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: I1a1dcab8ecd6e12ec03d14303517c8cb1e68ec60