LUCENE-5391: UAX29URLEmailTokenizer should not tokenize no-scheme domain-only URLs that are followed by an alphanumeric character (merged trunk r1557042)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1557046 13f79535-47bb-0310-9956-ffa450edef68