Improve start time for large web applications by avoiding CNFE from system class loader

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1539992 13f79535-47bb-0310-9956-ffa450edef68
Re-order tests to skip more expensive test when posisble

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1539996 13f79535-47bb-0310-9956-ffa450edef68