Yi Wu e62a763752 Blob DB: miscellaneous changes
Summary:
* Expose garbage collection related options
* Minor logging and counter name update
* Remove unused constants.
Closes https://github.com/facebook/rocksdb/pull/3451

Differential Revision: D6867077

Pulled By: yiwu-arbug

fbshipit-source-id: 6c3272a9c9d78b125a0bd6b2e56d00d087cdd6c8
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