Quick fix for grains init file.

Need to quite args.

TBR=rmistry
BUG=skia:

Review URL: https://codereview.chromium.org/798413002
Tweaks to buildbot ingestion

- Add logging
- Ensure that we Close() statements
- Modify Build.ReplaceIntoDB:
  - Inline BuildStep.ReplaceIntoDB for transaction simplicity
  - Better use of deferred Rollback and Commit.
- Use MySQL in local testing mode
- Use goroutines to ingest data from different masters in parallel
- Add shortcut for build #0
- Fix gitinfo details cache race

BUG=skia:3125

Review URL: https://codereview.chromium.org/802383002
Fix slave_hosts_cfg after adding new Mac slaves

BUG=skia:

Review URL: https://codereview.chromium.org/806773005
Move to skiamonitoring to Grafana 1.9.0.

BUG=skia:

Review URL: https://codereview.chromium.org/805873002