Adding an RDS log synchronization command
Add (optional) metrics for RDS Log Sync
Use different names for metric

While AWS CloudWatch does support multiple units per metric,
the management console interface does not.

That is, to actually see the various units, you have to retrieve
metrics using the API and pass to a custom reporting system.
Merge pull request #3 from Birdback/add-rds-log-sync

Adding an RDS log synchronization command