The client's List continues to be flakey. disabling until
the endpoint is stable.
Switching tests to use ansible 2.14, as 2.13 has issues with
spawning a docker container.
Upgrading the base python version as a consequence.
Removing the need for docker from unit tests, since that was failing
and also non-critical to run unit tests.
The spanner List API is returning intermittent 404s, which
is resulting in the spanner_database test failing every other
time.
Disabling the API until the test is more stable.
