pmap and pstack in jhsdb do not work on debug server

jhsdb supports pmap (jhsdb jmap) and pstack (jhsdb jstack --mixed), and they work fine if they attach to live process or to coredump, however they do not work on debug server as following:

```
$ jhsdb jmap --connect localhost
Attaching to remote server localhost, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 11.0.10+9
remote configuration is not yet implemented
```

pmap and pstack depend on CDebugger in SA, however it would not be set in case of remote debugger client. We can avoid it if we can delegate the process to debug server.