Add notes on agent and vxlan_agent

Change-Id: I4aa2a670d07aa07149199a9edcf6fa4c1bbb84dd
mockcassandra should download cassandra binary to /tmp/cache/[USER]/systemless_test instead of /tmp

Change-Id: I121d60b226309e5866925b99a6d8c04db08f5c14
Remove lock from metadata proxy, avoid deadlock in agent

Change-Id: Ib6e0a598d95ba2c3250c2d533d0d92e0c96037e8
Merge "Add notes on agent and vxlan_agent"
Merge "Remove lock from metadata proxy, avoid deadlock in agent"
Merge "mockcassandra should download cassandra binary to /tmp/cache/[USER]/systemless_test instead of /tmp"
Bug 1349167: zk path prefix is in SchemaTransformer class

Change-Id: Ib3888792df012d4fb9db03621ca2377c8104aebe
Closes-Bug: 1349167