moved enlinkd classes to proper package
Moved all the factories methid to EnLinkdElementFactory, added bridge link to linkednode page
Add null check

Conflicts:
	opennms-services/src/main/java/org/opennms/netmgt/linkd/DiscoveryLink.java
JUNIPER-ONLY: merge latest code
Merge branch 'space-14.1' of github.com:JunosSpace/opennms into space-14.1