add version command to the zookeeper server
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Key: ZOOKEEPER-1426
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1426
Project: ZooKeeper
Issue Type: Improvement
Components: scripts, server
Reporter: Patrick Hunt
Add a version command to the zkServer.sh.
Hadoop does this by having a special main class:
org.apache.hadoop.util.VersionInfo
We could do something similar, hook it into our current version information
class (perhaps add main to that class).
Would also need to add a new "version" command to zkServer.sh that calls this.
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