[11u] RFR: 8228448: Jconsole can't connect to itself

[Lindenmaier, Goetz]

Hi,

I am downporting this little change for 11.0.9-oracle parity.

Patch did not apply because of context.
http://cr.openjdk.java.net/~goetz/wr20/8228448-Jconsole_selfconnect-jdk11/01/

Please review.

https://bugs.openjdk.java.net/browse/JDK-8228448
https://hg.openjdk.java.net/jdk/jdk/rev/d6fe7d58d994

Best regards,
  Goetz.