PIG-3182: Pig currently lacks functions to trim the whitespace only on one hand side (sarutak via cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1506605 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk
Merge remote branch 'origin/trunk' into trunk-gd