Pull request #1456: CATS-1057: Verify that S3 bucket exists on startup, create it if not
Merge in CATS/clowder from CATS-1057-verify-that-s3-bucket-exists-on-startup to develop
* commit 'aed0c9995b0e4032db335f21f5d62006271a5b9f':
Add back Logger warning message on bucket create
Verify bucket exists on startup, create it if not