[API Deficiency] auto-detected locals need API to allow others to detect duplicates

When a new vm is autodetected, other plugins (such as jboss-as) which may wish to customize the view or nodes in some way or even the connection method, should have a chance to claim the detected vm as a duplicate of a connection they already represent.

For example, if the JMX view already has a (disconnected) Wildfly node for a stopped Wildfly instance, starting the Wildfly server will quickly cause the JVM Monitor code to discover the vm. The jmx connection provider in charge of turning this into a proper connection should first query all extenders to ask if this is a duplicate that should be suppressed or hidden.