Return to running tests using the warn log level
Return to running tests using the warn log level

The LOG_LEVEL environment variable is being set in the Rakefile, but
since [1], the relevant line in the test environment file to use this
value hasn't existed. This commit restores that line.

1: 601b505d9663dd6f35a0f62f00625b75d6fff5b6

alphagov/whitehall,alphagov/whitehall,alphagov/whitehall,alphagov/whitehall