boost default zk connect timeout from 15s to 30s

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1544999 13f79535-47bb-0310-9956-ffa450edef68
tests: clean up a bit

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1545005 13f79535-47bb-0310-9956-ffa450edef68