SOLR-5577: don't start timer thread on expiration

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1556003 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5383: fix changes2html to link pull requests (merged trunk r1555998)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1556009 13f79535-47bb-0310-9956-ffa450edef68
Merged revision(s) 1556012 from lucene/dev/trunk:
LUCENE-5385: add missing folder & svn:ignore

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1556013 13f79535-47bb-0310-9956-ffa450edef68