Adding resource consumption calculation for cron jobs.

Bugs closed: AURORA-825

Reviewed at https://reviews.apache.org/r/27317/
Cleaning up old vagrant cluster names.

Reviewed at https://reviews.apache.org/r/27352/
Optionally ignore unknown transaction operations.

Reviewed at https://reviews.apache.org/r/27538/
Revert "Adding resource consumption calculation for cron jobs."

This reverts commit 37cb06335a834de1894c882810a822f5f2ef69bc.

Reviewed at https://reviews.apache.org/r/27541/
AURORA-617: Switch pants 3rdparty to use python_requirements