[tests] Fix tests so they wait for v1 deployments (#3162)
[tests] Fix tests so they wait for v1 deployments (#3162)

Our tests periodically fail because we're creating too many v1 deployments on a free plan and it times out.

This limits the number of deployments by running v1 exclusively under Node 12.

It also adds a missing waitForDeployment().
zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli