Java builder pattern is not generated for rcp and grouping elements

Java builder pattern is not generated for rcp and grouping elements

- added method for checking whether generated type implements Augmentable interface.
If generated type is from rcp or grouping element then the generated type does not implement
Augmentable and java builder pattern is not generated.
- added test way that a generated type implements Augmentable into GeneratorJavaFileTest
- bugfix:
	bug - javax.management.Notification import was used in generated interfaces extending Notification.
	consequences - Therefore generated interfaces contained errors. javax.management.
	fix - Notification was replaced by org.opendaylight.yangtools.yang.binding.Notification

Signed-off-by: Martin Sunal <msunal@cisco.com>