Implement support for provisioning hosts to ClimateClient

Cloud Admin must have possibility to dedicate hosts to Climate.
Consequently, adding host-{list,CRUD} to shell commands.

Partially implements blueprint python-client

Change-Id: I93c52d4b9c29aad3c3ff7aba2a105adb60422466
Merge "Implement support for provisioning hosts to ClimateClient"