Fix pre commit noise and failing master

[potiuk]

This PR has to commits (will rebase rather than squash):

Removes the noise for pre-commit tests:

• [AIRFLOW-5411] Remove the noise produced while running failed pre-com… …

Fixes failing master because of not-rebased but merged change (it passed Travis CI before):

• fixup! [AIRFLOW-4964] Add BigQuery Data Transfer Hook and Operator (#…

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[potiuk]

@mik-laj -> should we merge that before Travis is complete? With the nature of the changes and fact that master is broken we should merge it asap. I think the noise should be gone now as well.