The unit tests were previously consuming an excessive amount of memory
(4GB+) due to plugin instances persisting in memory. Deallocation was
not possible where a combination of circular references and mocking
was involved. This patch ensures that only NeutronManager holds a
plugin reference and that all other references are instances of
weakref.proxy. Residual memory footprint for tox executed on a
12-core machine has been reduced to ~1.3GB. Plugin deallocation is
validated at the end of each test to prevent regressions.
This change also includes fixes to unit tests that depended on plugin
instances persisting across tests.
Partial-Bug: #1234857
Change-Id: Ia1f868c2d206eb72ef77d290d054f3c48ab58c94
6db48dd688