PIG-3798: Registered jar in pig script are appended to the classpath multiple times (cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1583978 13f79535-47bb-0310-9956-ffa450edef68
PIG-3819: e2e tests containing "perl -e "print CHANGES.txt;" fails on Hadoop 2

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1584210 13f79535-47bb-0310-9956-ffa450edef68