Changbin Liu a8f341a6c8 Implement ZooKeeper as persistence storage backend ...

Test cases are in taskflow/tests/unit/persistence/test_zk_persistence
and taskflow/tests/unit/persistence/test_zake_persistence. The former
requires a working ZooKeeper cluster, and the latter uses a fake
in-memory backend. Right now, due to the lack of ZooKeeper in Jenkins,
the former test is disabled. To enable it, simply uncomment the code
and change "hosts" in conf to your ZooKeeper cluster's addresses.

Also moved some shared helper functions from
taskflow/persistence/backends/impl_dir to
taskflow/utils/persistence_utils.

Implements: blueprint zk-logbook

Change-Id: Ia1b7ef8312a1761515515fd206b36be135119737

2014-01-28 23:04:55 -05:00

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