[CF] Make LogDeletionTest less flakey
Summary: Retry GetSortedWalFiles() and also wait 20ms before counting number of log files. WaitForFlush() doesn't necessarily wait for logs to be deleted, since logs are deleted outside of the mutex. Test Plan: column_family_test Reviewers: dhruba, haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D16371
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