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.
gcp_spanner_database erroneously used LRO handling on delete,
rather than a standard synchronous function. One side effect
was not catching 404s as a not found error code.
