Add cache of recently seen blobs in CloudBlobStore#1225

Merged

zzmao merged 4 commits intolinkedin:masterfrom lightningrob:vcr-blobstore-cache

Aug 6, 2019

+210-32

Commits on Jul 25, 2019

Add cache of recently seen blobs in CloudBlobStore to reduce unnecessary Azure requests.
lightningrob
committed

Commits on Aug 5, 2019

Address David's review comments.
lightningrob
committed

Commits on Aug 6, 2019