This test is designed to verify that an ONOS cluster behaves correctly when
nodes are added or removed from a cluster dynamically via modifying a remote
cluster metadata file.


The gerneral structure for the test:
- Startup
- Assign switches
- Verify ONOS state and functionality
    - Device mastership
    - Intents
    - Leadership election
    - Distributed Primitives
- Scale ONOS cluster size from 1 to 7 to 1 by increments of 2
    - Modify cluster metadata file
    - Start or stop ONOS nodes
    - Verify ONOS state and functionality
    - Dataplane failures
        - link down and up
        - switch down and up