Apache Curator 2.7.1 发布，zookeeper 客户端简化

Apache Curator 2.7.1 发布了，zookeeper 的客户端调用过于复杂，Apache Curator 就是为了简化zookeeper客户端调用而生，利用它，可以更好的使用zookeeper。

改进记录：

Bug

• [CURATOR-175] - If zookeeper is down when discovery is started, it fails to register when the zookeeper comes up for the first time.

• [CURATOR-179] - Sequential path creation of /somepath/N throws exception

• [CURATOR-181] - discovery: registration of wrong/old service instance on RECONNECT

Improvement

• [CURATOR-111] - CuratorFramework.Builder should allow adding multiple auths

• [CURATOR-140] - Support the initial data for the node in InterProcessReadWriteLock

• [CURATOR-166] - Make ZKPaths accept more than one child

• [CURATOR-170] - ChildReaper would benefit by being able to manage multiple paths

• [CURATOR-176] - Currently difficult to write ServiceDiscovery admin console

• [CURATOR-177] - Pull request: Use Curator in thread names