Adding compute server tests

This patch adds following compute server tests
    1. create server
    2. delete server
    3. update server
    4. create agent
    5. instance migration
    6. instance live migration
    7. get server passowrd
    8. get virtual interfaces

Partially-Implements: blueprint initial-tests-compute

Change-Id: I941e72c1277b3d0a9563fa9de0c51920162263ac
5 files changed