RFR: 8263635: Add --prefix option to jhsdb debugd

[Serguei Spitsyn]

On Sun, 25 Apr 2021 03:15:07 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

> `jhsdb debugd` supports server name prefix with `sun.jvm.hotspot.rmi.serverNamePrefix` system property. It will be used as remote name for SA remote object. It is "SARemoteDebugger" by default.
> 
> As a result, remote name will be constructed as following:
> 
> 
> //host[:port]/<serverNamePrefix>['_'<id>]
> 
> 
> However we have no way to set it excepting system property. jhsdb should provide the way to set it as a command line option. And also we should add the way to specify the prefix when we connect to debug server. I will add it like `--connect id at server:1234/prefix`.
> 
> I've also filed [CSR for this PR](https://bugs.openjdk.java.net/browse/JDK-8265897). Please review it.
> This PR modifies DisableRegistryTest.java, but it has been addressed in ProblemList-zgc.txt now. So this PR does not affect ZGC.

I've looked at the CSR and added a comment with a question.

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PR: https://git.openjdk.java.net/jdk/pull/3669