Fix beans.xml location in deltaspike-beanbuilder and cdi-add-interceptor-binding

- added beans.xml to beanbuilder, it was missing completely
- moved beans.xml in cdi-add-interceptor-binding from src/main/resources to src/main/webapp/WEB-INF as per JSR-299, 12.1; both work in Weld, but the latter prevents JBDS from throwing a warning about missing beans.xml