Add a DB Property For Number of Deletions in Memtables
Summary: Add a DB property for number of deletions in memtables. It can sometimes help people debug slowness because of too many deletes. Test Plan: Add test cases. Reviewers: rven, yhchiang, kradhakrishnan, igor Reviewed By: igor Subscribers: leveldb, dhruba, yoshinorim Differential Revision: https://reviews.facebook.net/D35247
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