This migrates the above files from tempest.
This includes tempest commits:
* servers_client.py : I7174723f907fd8962d9d12fe76bec2dc06883938
* servers.py : I10a8c32b53f15063dab087d67123598800b141a0
* test_servers_client.py: I7174723f907fd8962d9d12fe76bec2dc06883938
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: I9234f063a72bd58100bfffd3db38718a257ce6ea