Dual Attachment Support#4955

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asteed wants to merge 4 commits intoapache:masterfrom

adobe-apiplatform:dual-attachment-support

Commits on Aug 24, 2020

Add support for Legacy AttachmentStore to support data migration
Andy Steed
committed
scalafmt fixes
Andy Steed
committed
Moved ClientHolder to it's own file and removed all unnecessary imports
Andy Steed
committed

Commits on Aug 28, 2020

Reworked to use explicit AttachmentStore for S3 and AZ instead of picking up from config
Andy Steed
committed