hg: jdk/submit13: 8226608: Hide the onjcmd option from the help output

[ralf.schmelter at sap.com]

Changeset: f3b62797e2d0
Author:    rschmelter
Date:      2019-06-27 00:51 -0700
URL:       http://hg.openjdk.java.net/jdk/submit13/rev/f3b62797e2d0

8226608: Hide the onjcmd option from the help output
Reviewed-by: sspitsyn, clanger

! src/hotspot/share/services/diagnosticCommand.cpp
! src/jdk.jdwp.agent/share/native/libjdwp/debugInit.c