Add rocksdb.num-live-versions: number of live versions
Summary: Add a DB property about live versions. It can be helpful to figure out whether there are files not live but not yet deleted, in some use cases. Test Plan: make all check Reviewers: rven, yhchiang, igor Reviewed By: igor Subscribers: yoshinorim, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D33327
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