LUCENE-4979: LiveFieldValues can work with any ReferenceManager

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1479971 13f79535-47bb-0310-9956-ffa450edef68
allow use of nightly-smoke on a modified checkout, by passing skip for the svn revision

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1479977 13f79535-47bb-0310-9956-ffa450edef68