Merged revision(s) 1592075, 1592078 from lucene/dev/trunk:
LUCENE-5639: Fix token class to correctly implement PoistionLengthAttribute

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1592080 13f79535-47bb-0310-9956-ffa450edef68