RFR: 8209790: SA tools not providing option to connect to debug server

[Yasumasa Suenaga]

Hi all,

Please review this change:
  JBS: https://bugs.openjdk.java.net/browse/JDK-8209790
  CSR: https://bugs.openjdk.java.net/browse/JDK-8224979
  webrev: http://cr.openjdk.java.net/~ysuenaga/JDK-8209790/webrev.00/

In JDK 8 or earlier, some tools (jstack, jmap, jinfo) can connect to 
debug server (jsadebugd). However it has not done so since JDK 9 because 
jhsdb cannot accept the attach request to debug server.
So I want to introduce new option `--remote` to connect to debug server.

I created CSR for this issue. So please review it together.


Thanks,

Yasumasa