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Behrad Zari discovered [1] and Josiah reported [2]: if you block and wait for a list to exist, but the list creates from a non-push command, the blocked client never gets notified. This commit adds notification of blocked clients into the DB layer and away from individual commands. Lists can be created by [LR]PUSH, SORT..STORE, RENAME, MOVE, and RESTORE. Previously, blocked client notifications were only triggered by [LR]PUSH. Your client would never get notified if a list were created by SORT..STORE or RENAME or a RESTORE, etc. Blocked client notification now happens in one unified place: - dbAdd() triggers notification when adding a list to the DB Two new tests are added that fail prior to this commit. All test pass. Fixes #1668 [1]: https://groups.google.com/forum/#!topic/redis-db/k4oWfMkN1NU [2]: #1668