Merged revision(s) 1591333 from lucene/dev/branches/branch_4x:
LUCENE-5632: Transition Version constants from LUCENE_MN to LUCENE_M_N

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1591365 13f79535-47bb-0310-9956-ffa450edef68