Back-port various StoreConfig improvements:
- Consistently handle missing StoreConfig MBean for Server and Context case.
- Improve integration with Manager application
- Partial revert of r1645466 since MBean should be hard-coded
- Remove dependency on StandardServer

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc8.0.x/trunk@1645480 13f79535-47bb-0310-9956-ffa450edef68
Whoops. That utility method isn't available in 8.0.x

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc8.0.x/trunk@1645481 13f79535-47bb-0310-9956-ffa450edef68