Added test suite and case to cover 'availability zone'

This was required to test advanced scenarios.

* Added a new 'admin' folder in 'scenario' folder
  to test advanced operations.

* Added a new file to the 'admin' folder that contains
  test cases for floating ip with admin privileges.

* Added a scenario test that verify valid connection
  between two instances on a single compute node
  using availability-zone.

* Changed 'base.py' to enable booting an instance with
  admin privileges.

Change-Id: I711a10eef321622c335e35b84e386b01d73b938a
4 files changed