Add version constant for 4.11.0

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1619577 13f79535-47bb-0310-9956-ffa450edef68
Fix 4.11.0 constant to be latest and deprecate 4.10.0 constant

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1619589 13f79535-47bb-0310-9956-ffa450edef68
SOLR-3617: minor issue if the user selects a port that is in use for the cloud example.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1619592 13f79535-47bb-0310-9956-ffa450edef68