RFR (S) 8224673: Adjust permission for delayed starting of debugging

[Schmelter, Ralf]

Please review this small change. It changes the permission needed to delayed start the debugging (when enabled with onjcmd=y) via a diagnostic mbean.

webrev: http://cr.openjdk.java.net/~rschmelter/webrevs/8224673/webrev.0/
bugreport: https://bugs.openjdk.java.net/browse/JDK-8224673

Best regards,
Ralf
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