Testing: unexpected simulation engine behavior

[ljwoods2]

The client should be able to detect & correctly fail out on:

• partial frames being sent through the socket (such as in the case of socket overflow or simulation being sent SIGKILL)
  • this case should be handled with the socket both opened and closed
• packets sent in the wrong order

Testing these things will require use of imdclient/tests/server.py. See imdclient/tests/imdclient.py::TestIMDClientV3 for examples on using the test server