Add and enforce python deprendency hashes

BUG=b:314884432
TEST=Built docker images locally

Change-Id: I8cae18bc4a514ca43122aa0c802e24b9cb0c6255
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/moblab/+/5168327
Tested-by: Varun Thammineni <varunth@google.com>
Reviewed-by: Varun Thammineni <varunth@google.com>
Auto-Submit: Michal Matyjek <mmatyjek@google.com>
Commit-Queue: Varun Thammineni <varunth@google.com>
Tested-by: Michal Matyjek <mmatyjek@google.com>
6 files changed