The wait_for_zones_loaded fixture waits for the "all zones loaded"
message in the named log file before the test function can proceed.
(cherry picked from commit 662a88055c)
Ensure pytest picks up our python test modules, since we're using
tests_*.py convention, which is different from the default.
Configure pytest logging to display the output from all tests (even the
ones that passed). This ensures we have sufficient amount of information
to debug test post-mortem just from the artifacts.
(cherry picked from commit 08c4e35bc0)