* Updated module-info.java to reference the "jetty.servlet.api" module.
* Updated POMs to reference the o.e.j.toolchain:jetty-servlet-api artifact.
* Removed references to jetty-schemas.jar.
* Updated attribute "org.eclipse.jetty.server.webapp.ContainerIncludeJarPattern"
to match the new Jetty Servlet API jar.
Signed-off-by: Simone Bordet <simone.bordet@gmail.com>