This is a pure refactor so not having any unit test change actually
signals that the refactor did not change the existing behavior which is
good.
The unit test run on this patch only covers the eventlet mode but higher
in the series we run unit test with native threading mode in a separate
job that will complement the coverage for this patch.
Change-Id: Iafc96c93a0d4c406b77902942b2940653441fe38
Signed-off-by: Kamil Sambor <kamil.sambor@gmail.com>
9f58f596db