remove token from notifier middleware

notifier middleware is capturing token and sending it to MQ. this
is not advisable so we should filter it out.

Closes-Bug: #1321080
Change-Id: Ia1bfa1bd24989681db1d2f385defc12e69a01f8d
Improve module-level mocks in midonet tests

Remove unnecessary module-level mocks and replace
them with test-specific mocks so they don't persist
through the entire test suite.

Partial-Bug: #1316401
Change-Id: I49039749bb700ec0a88639f4772701ba3b920352
Add flat type driver unittests

Partial-Bug: #1269127

Change-Id: Ib56c5823ddb927d8269cfcdaa8df8b0f78dc5a6e
Merge "Improve module-level mocks in midonet tests"
Merge "remove token from notifier middleware"
Merge "Add flat type driver unittests"