test(integration): properly waited for the image pulls to complete

[travi]

this uses the technique for waiting for the pull to complete from the dockerode readme and mostly gets rid of our dependence on get-stream.

the remaining get-stream usage is the .array() that is removed in v7. i suggest we deal with that usage separately from this PR

[travi]

it appears that the pulls are happening before each test in the integration file. would be better to do the pulls before the overall suite run so that they only happen once

[travi]

it appears that the pulls are happening before each test in the integration file. would be better to do the pulls before the overall suite run so that they only happen once

i was wrong. it is using test.before, not test.beforeEach, so this should already be correct. since we are actually fully waiting for the pulls, we may need to extend the timeout for the integration test, though

[travi]

it looks like this change does not fix the flakiness, but i think it is still a worthwhile change to get merged

[github-actions]

🎉 This PR is included in version 21.0.6 🎉

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