If stestr failed, then no node info was logged.
Logging node info is now handled in pre and post stages of Zuul.
Additionally Zuul v3 migration recommendations were applied
and some unused code removed improving general readability.
Change-Id: Iae9d37cb76997ba8389e21c7e2a3bf5905abe029
Signed-off-by: Radosław Piliszek <radoslaw.piliszek@gmail.com>
c7ac0f0de0