PIG-3561: Clean up PigStats and JobStats after PIG-3419 (cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1540855 13f79535-47bb-0310-9956-ffa450edef68
PIG-3563: support adding archives to the distributed cache (jdonofrio via cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1540908 13f79535-47bb-0310-9956-ffa450edef68
PIG-3507: It fails to run pig in local mode on a Kerberos enabled Hadoop cluster (chiyang via cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1540915 13f79535-47bb-0310-9956-ffa450edef68