update server.xml to let web-inf to be accessible

When we deploy the spring-music, we realized that the web-inf folder is disabled for liberty. Will it be nice to enable that so the migration from tomcat is more smoothy?

https://groups.google.com/a/cloudfoundry.org/forum/?utm_medium=email&utm_source=footer#!msg/vcap-dev/lC2KCxgMIXs/m2UvpWwHxxwJ