Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=54380
Changelog for r1430147

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1430178 13f79535-47bb-0310-9956-ffa450edef68
Merged revision 1430165 from tomcat/trunk:
Fix NPE in WebappLoader.stopInternal that happens after a failed start.
Add tests that a context can be started again after a failure.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1430182 13f79535-47bb-0310-9956-ffa450edef68