When running the test suite in CI (where requests are centralized from
relatively few IPs), we'd occasionally hit Dockerhub's rate limits.
Luckily Hashicorp runs a (limited) public mirror of the containers we
need, so we can switch to them here in the tests.
For consistency between developer and CI, we've opted to have the tests
always pull from the Hashicorp mirror, rather than updating the CI
runner to prefer the mirror.
We exclude nomad and influxdb as we don't presently mirror these repos.
Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>
Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>
