LUCENE-5487: consolidate the FakeScorers within one package

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene5487@1576273 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5487: consolidate the FakeScorers within one package

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene5487@1576274 13f79535-47bb-0310-9956-ffa450edef68