PIG-4153: Pin Tez to 0.5.0 release (PIG-4153-3.patch)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1622562 13f79535-47bb-0310-9956-ffa450edef68
PIG-4143: Port more mini cluster tests to Tez - part 7 (PIG-4143-5.patch)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1622564 13f79535-47bb-0310-9956-ffa450edef68
Merge latest trunk changes


git-svn-id: https://svn.apache.org/repos/asf/pig/branches/spark@1622567 13f79535-47bb-0310-9956-ffa450edef68