This migrates the above files from tempest. This includes tempest commits:
* api_schema/../agents.py : Ica929c402a3d042ae751302384e68853eb28b405
* services/compute/agents_client.py: I65c60ab85945e66bd696ec4d89ad73cc4f7f2004
* tests/../test_agents_client.py : I3ad6761651cec5e66012d08e6b63322f53286a5c
* tests/services/compute/base.py : Ifc2eb17bbe4f2e658f657760510bdc08e3d60251
to see the commit history for these files refer to the above sha1s in the tempest repository
Change-Id: Ifa45e5f29b2f8d4b0a820a763713e5a83426997a
93528c1318