[OPENEJB-1282] mappedName fails to work for @Singleton

[Matthew B. Jones]

All,

When switching a bean over from @Stateless(mappedName="something") to
@Singleton(mappedName="something"), I noticed that the current 3.1.3 builds
fail to correctly utilize the 'mappedName' attribute for @Singleton. I've
created the JIRA https://issues.apache.org/jira/browse/OPENEJB-1282 and
provided a simple few lines in a patch.txt attached to the issue. Reviewal,
approval, and acceptance would be much appreciated :-).

- Matthew Jones