Error: Could not find or load main class org.apache.zookeeper.server.quorum.QuorumPeerMain
解决方法：
linux执行./zkServer start时启动zookeeper时失败，查看日志文件出现：Error: Could not find or load main class org.apache.zookeeper.server.quorum.QuorumPeerMain
原因是我下载错了版本，下了apache-zookeeper-3.6.2.tar.gz，正确的是要下载apache-zookeeper-3.6.2-bin.tar.gz
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