Add some smoke tests to core-test

Weld is currently missing a set of smoke tests, a suite that exercises the key details of CDI (e.g. managed beans, session beans, observers, decorators, interceptors, servlet integration, jsf integration, the various contexts) but that doesn't delve into every specific of the spec. IOW a suite of say 50 tests that can run quickly, even in container.

These would be very useful to run with extensions such as Solder added to ensure that they don't alter the default behaviour accidentally or for testing non-spec-compliant containers such as Tomcat, Jetty or GAE.