Add a set of exclusive parameters to the Network QoS policy:
--default: makes this policy the default policy for
the project to which the qos policy belongs.
--no-default: unset the property.
Closes-Bug: #1639220
Depends-On: If5ff2b00fa828f93aa089e275ddbd1ff542b79d4
Depends-On: Ibe7b7881cb190bfd5582f35b6de51a8bc21135de
Change-Id: I0269b837dc29bbd8ee2089d847cadb72d800fa30