chang UnixUserGroupInformation to use "user.name" instead of whoami
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Key: HADOOP-6770
URL: https://issues.apache.org/jira/browse/HADOOP-6770
Project: Hadoop Common
Issue Type: Improvement
Affects Versions: 0.20.1
Reporter: sam rash
at present, we fork and use whoami to get the current username. we can avoid
the fork(which can be slow) and user System.getProperty("user.name") which is
set by the jvm
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