[log4j] @PluginBuilderAttribute in master

[Gary Gregory]

Hi All:

The deprecated @PluginBuilderAttribute in master does not seem to use its
value().

Is that a bug and if not how am I supposed to port a builder that has an
ivar like:

        @PluginBuilderAttribute(value = "connection")
        @Required(message = "No connection string provided")
        private String connectionStringSource;

?

Gary