HIVE-3135. add an option in ptest to run on a single machine (Namit Jain via kevinwilfong)
HIVE-3135. add an option in ptest to run on a single machine (Namit Jain via kevinwilfong)

git-svn-id: c2303eb81cb646bce052f55f7f0d14f181a5956c@1352973 13f79535-47bb-0310-9956-ffa450edef68

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