[wal changes 3/3] method in DB to sync WAL without blocking writers
Summary: Subj. We really need this feature. Previous diff D40899 has most of the changes to make this possible, this diff just adds the method. Test Plan: `make check`, the new test fails without this diff; ran with ASAN, TSAN and valgrind. Reviewers: igor, rven, IslamAbdelRahman, anthony, kradhakrishnan, tnovak, yhchiang, sdong Reviewed By: sdong Subscribers: MarkCallaghan, maykov, hermanlee4, yoshinorim, tnovak, dhruba Differential Revision: https://reviews.facebook.net/D40905
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