various shell script fixes
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Key: HADOOP-8026
URL: https://issues.apache.org/jira/browse/HADOOP-8026
Project: Hadoop Common
Issue Type: Bug
Affects Versions: 1.0.0
Reporter: Allen Wittenauer
Attachments: HADOOP-8026-branch-1.0.txt
Various shell script fixes:
* repair naked $0s so that dir detections work
* remove superfluous JAVA_HOME settings
* use /usr/bin/pdsh in slaves.sh if it exists
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