sdong 38d286f146 Clean-up WAL directory before running db_test
Summary: DBTest doesn't clean up wal directory. It might cause failure after a failure test run. Fix it.

Test Plan:
Run unit tests
Try open DB with non-empty db_path/wal.

Reviewers: rven, yhchiang, kradhakrishnan, igor

Reviewed By: igor

Subscribers: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D35559
2015-03-20 12:34:24 -07:00
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