New functional-endpoint-bindings tests are non-voting

[Martin Packman]

The new functional-endpoint-bindings tests on maas 2.0 and 2.1 are
non-voting while they gather a few runs and and the test environment
is tweaked.

<http://juju-ci.vapour.ws/job/functional-endpoint-bindings-maas-2-0/>
<http://juju-ci.vapour.ws/job/functional-endpoint-bindings-maas-2-1/>

Includes dynamic maas networking management that should make the tests
safe to run in parallel with other jobs, and form a basis for further
networking tests.

Careful watchers of the revisions test results will have noted some
fallout from the initial setup, all of that should now be resolved so
treat any new failures of maas substrate testing as significant.

Martin