Fix a bug in ReadOnlyBackupEngine
Summary: This diff fixes a bug introduced by D28521. Read-only backup engine can delete a backup that is later than the latest -- we never check the condition. I also added a bunch of logging that will help with debugging cases like this in the future. See more discussion at t6218248. Test Plan: Added a unit test that was failing before the change. Also, see new LOG file contents: https://phabricator.fb.com/P19738984 Reviewers: benj, sanketh, sumeet, yhchiang, rven, sdong Reviewed By: sdong Subscribers: dhruba, leveldb Differential Revision: https://reviews.facebook.net/D33897
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