[SPARK-5751] [SQL] Sets SPARK_HOME as SPARK_PID_DIR when running Thrift server test suites#4758

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liancheng wants to merge 2 commits intoapache:masterfrom

liancheng:thriftserver-pid-dir

Commits on Feb 25, 2015

Sets SPARK_HOME as SPARK_PID_DIR when running Thrift server test suites
liancheng
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Commits on Feb 27, 2015

Uses temporary directory as Thrift server PID directory
liancheng
committed