Add a metric for total federalist-s3 buckets < 1000

[apburnes]

The AWS org Federalist uses to create S3 Buckets has a limit of 1000 buckets. Add metrics to identify when we are approaching the 1000 bucket limit.

Acceptance Criteria

• [ ] Add the 1000 bucket limit check to the New Relic metrics
• [ ] Add to the apps/metrics
• [ ] Use CF to query for all of the s3 instances across all of the org's spaces to check against the 1000 instance limit

[davemcorwin]

This is an AWS limitation that applies to all buckets provided by the broker. I think this level of monitoring/alerting belongs to cloud.gov, thoughts? @18F/federalist-admins @bengerman13