tests/integration: update some tests for updated error-messages #3165
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I was in the process of cleaning up some error-messages in moby/moby#46213 (likely will be moved to a separate PR), and it looks like the docker-py tests were depending on strings that will be removed;
This updates the tests to match on a string that will be present in both the old and new error-messages, but added a "lower()", so that matching will be done case-insensitive (Go errors generally should be lowercase).