RFR: 8262520: Add CLHSDB command to connect to debug server [v4]

[Chris Plummer]

On Wed, 3 Mar 2021 02:29:18 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

>> `attach` command on CLHSDB supports to attach live process (PID) and coredump, but it cannot connect to debug server. CLHSDB does not have a command to connect to debug server.
>> 
>> Other jhsdb commands (jstack, jmap, etc...) can connect debug server via `--connect` option, so CLHSDB should connect to it.
>> 
>> After this change, you can connect to debug server with 'connect <hostname>'.
>
> Yasumasa Suenaga has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix comments

src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/CLHSDB.java line 236:

> 234:         catch (DebuggerException e) {
> 235:             final String errMsg = formatMessage(e.getMessage(), 80);
> 236:             System.err.println("Unable to connect to machine \"" + debugServerName + "\":\n\n" + errMsg);

"machine" -> "debug server"

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PR: https://git.openjdk.java.net/jdk/pull/2773