This adds support for Ansible 5. As mentioned in the reno, only
the major version is specified; that corresponds to major.minor in
Ansible core, so is approximately equivalent to our current regime.
The command module is updated to be based on the current code in
ansible core 2.12.4 (corresponding to community 5.6.0). The previous
version is un-symlinked and copied to the 2.8 and 2.8 directories
for easy deletion as they age out.
The new command module has corrected a code path we used to test
that the zuul_stream module handles python exceptions in modules,
so instead we now take advantage of the ability to load
playbook-adjacent modules to add a test fixture module that always
raises an exception. The zuul stream functional test validation is
adjusted to match the new values.
Similarly, in test_command in the remote tests, we relied on that
behavior, but there is already a test for module exceptions in
test_module_exception, so that check is simply removed.
Among our Ansible version tests, we occasionally had tests which
exercised 2.8 but not 2.9 because it is the default and is otherwise
tested. This change adds explicit tests for 2.9 even if they are
redundant in order to make future Ansible version updates easier and
more mechanical (we don't need to remember to add 2.9 later when
we change the default).
This is our first version of Ansible where the value of
job.ansible-version could be interpreted as an integer, so the
configloader is updated to handle that possibility transparently,
as it already does for floating point values.
Change-Id: I694b979077d7944b4b365dbd8c72aba3f9807329
ebf5c96d57