Add V3 Test to get Spice & RDP console of server

This patch adds Nova V3 API Test to get the Spice and RDP
console of a server

Partially implements blueprint nova-v3-api-tests

Change-Id: I9560983c29398f9479e4139ef2f096902c3eae66
Merge "Add V3 Test to get Spice & RDP console of server"