plugin.py is really hard to test because good part of
its logic happend during code importation.
It's test depends on the base TestCase that mocks too
much thinks in a way that makes hard to spot real problems.
The test also fails to test re-authenthication bug because
of bad mocking.
This code should fix above problems. It also remove some
logic in the hooks: exceptions are already captured and
logged by collectd and there is no need doing it inside of
hooks. Init hook is also pointless from the perspective
of this plugin initialization and it was removed.
Co-authored-by: Emma Foley <emma.l.foley@intel.com>
Related-Bug: #1615349
Change-Id: I4db8a94243ecbe98cd6bc13e4b66293172346dcd
9cf7d56f5a