CAMEL-5206: Duplicate ServetlName now detected and fail to start servlet if detected. This can be an issue when people use shared bootstrap lib for sharing Camel JARs in a container such as Tomcat.

git-svn-id: https://svn.apache.org/repos/asf/camel/trunk@1443485 13f79535-47bb-0310-9956-ffa450edef68