RFR: 8263636: Add --disable-registry option to jhsdb debugd [v5]

[Daniel D.Daugherty]

On Wed, 7 Apr 2021 00:12:11 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

>> `jhsdb debugd` will start RMI registry by default, but we want to prevent it due to port confliction in some cases. We can control it with `sun.jvm.hotspot.rmi.startRegistry` system property. However we have no way to set it excepting system property. jhsdb should provide the way to set it as a command line option.
>> 
>> This PR introduces `--disableregistry` to `jhsdb debugd`. Please review [CSR](https://bugs.openjdk.java.net/browse/JDK-8264021) too.
>
> Yasumasa Suenaga has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Rename --disableregistry to --disable-registry

Serviceability Reviewers!
When a new SA test is added, please ask if the new test has been run with ZGC.
If it doesn't work with ZGC, then it probably needs to be added to ProblemList-zgc.txt
with an entry referring to this bug:

JDK-8220624 SA: Out of sync with ZGC's internal data structures

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PR: https://git.openjdk.java.net/jdk/pull/3233