SOLR-249 -- adding error codes not used in solr, but useful for custom plugins.

UNAUTHORIZED( 401 ),
  FORBIDDEN( 403 ),

git-svn-id: https://svn.apache.org/repos/asf/lucene/solr/trunk@542737 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/solr/core/SolrException.java

@@ -32,6 +32,8 @@ public class SolrException extends RuntimeException {
    */
   public enum ErrorCode {
     BAD_REQUEST( 400 ),
+    UNAUTHORIZED( 401 ),
+    FORBIDDEN( 403 ),
     NOT_FOUND( 404 ),
     SERVER_ERROR( 500 ),
     SERVICE_UNAVAILABLE( 503 );