try a 300ms wait on startup to be sure our core(s) have loaded

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1420954 13f79535-47bb-0310-9956-ffa450edef68

solr/core/src/java/org/apache/solr/client/solrj/embedded/JettySolrRunner.java

@@ -237,6 +237,8 @@ public class JettySolrRunner {
           throw new RuntimeException("Jetty/Solr unresponsive");
         }
       }
+      
+      this.wait(300); // always 100ms - can take a moment for our cores to come up
     }
     
     System.clearProperty("shard");