Add BOSH Resurrection checks

[cweibel]

Changes proposed in this pull request:

• Runs a daily check to see of resurrection is enabled for each BOSH director, if not, drops a warning in Slack. With resurrection enabled, if a VM is unreachable after 30 seconds BOSH health monitor will replace it automatically without operator intervention (aka self healing)
• Added master and tooling creds to /concourse/main/bosh-director-info on concourse-credhub-production so we don't have to manage access via individual per pipeline bosh creds. Will consolidate these over time.
• Been meaning to do this for 2 years, finally resolves a sticky note I've had that long. Yay IP sprints.
• Part of https://github.com/cloud-gov/product/issues/2836

security considerations

None, secrets, as noted above, are stashed in credhub.