Kyua 0.12 introduces support to run test cases in parallel.
Such support is currently disabled by default because 1) the code is
very new and 2) not all tests can be run in parallel safely. It is
up to the user to requrest this functionality.
Tests with side-effects, or tests that use unique system resources,
must be marked with is_exclusive=true to tell Kyua to run them on
their own. I have caught a couple of obvious cases that need this
property, but I'm sure there are more.
Kyua 0.11 chokes on unknown properties so this change can only be
committed once Kyua 0.12 is widely available in the binary package
repositories, Jenkins is updated, and Jenkins is confirmed to work
with the new release.