unittest fix/workaround - remove CPU options and disable control_server

[brpollock]

There were two problems with test.py:

1, No options argument passed to CPU.__init__()

• CPU options were only used to pass 'pc'. Rather than adding another
  get_options/Options to tests,py, replacing options with a pc argument
  removes CPU's dependency on command-line options.

2. Failed to init control_server due to Address already in use

• As a workaround for 'Address already in use', control_server is now
  enabled/disabled by memory.use_bus (which is False in unit tests).

With these changes, all 59 tests pass:

...........................................................
----------------------------------------------------------------------
Ran 59 tests in 0.336s

OK