LUCENE-6007: 'mvndeps' Ant task: exclude the 'start' configuration (only the jetty-start jar at this point) when parsing solr/example/ivy.xml for dependencies

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1632829 13f79535-47bb-0310-9956-ffa450edef68