Relax requirements for obtaining a BeanManager reference from JNDI

The spec says:

Java EE components may obtain an instance of BeanManager from JNDI by looking up the name java:comp/BeanManager.

This is limiting since extensions often need to get a BeanManager reference from a non-EE component, e.g.:

• https://github.com/seam/solder/blob/develop/impl/src/main/java/org/jboss/solder/beanManager/DefaultJndiBeanManagerProvider.java
• https://resteasy.svn.sourceforge.net/svnroot/resteasy/trunk/jaxrs/resteasy-cdi/src/main/java/org/jboss/resteasy/cdi/CdiInjectorFactory.java