Corrects mgmt-taskmanager startup method

Adds 'conf' as an argument to mgmt_main which is accessed in startup
method.

Change-Id: Ie17ed92137200f0562894950df0479749492faf4
Closes-Bug: #1323395
switch from mox to mox3

Mox3 is an unofficial port of the Google mox framework to Python 3.

Closes-bug: 1283482
Change-Id: I3f558420bc720880eb91fca7b936bdcd6949a513
Merge "Corrects mgmt-taskmanager startup method"
Merge "switch from mox to mox3"