Minimize number of AWS calls

[alanbover]

Every time to time, AWS is rejecting API calls. Review, and try to minimize those calls.

Error:
time="2017-07-12T18:49:11Z" level=debug msg="Unable to find instances with DEATH_NODE_MARK tag"
time="2017-07-12T18:49:11Z" level=error msg="RequestLimitExceeded: Request limit exceeded.\n\tstatus code: 503, request id: c6ef5d71-6037-4f29-b108-76778b3cc3d5"