JCR-4382: Update spotbugs plugin to 3.1.7
JCR-4382: Update spotbugs plugin to 3.1.7

git-svn-id: 02b679d096242155780e1604e997947d154ee04a@1844000 13f79535-47bb-0310-9956-ffa450edef68

apache/jackrabbit,apache/jackrabbit,apache/jackrabbit