RFR: JDK-8152435: (CL)HSDB should be started with no argument

[Yasumasa Suenaga]

HI all,

After JDK-8151709, CLHSDB and HSDB cannot be started with no argument via jhsdb. 
CLHSDB and HSDB can attach process / core after starting.
jhsdb should support it.

I uploaded webrev:

  http://cr.openjdk.java.net/~ysuenaga/JDK-8152435/webrev.00/

This patch passed jtreg test sun/tools/jhsdb in jdk repos.
Could you review it?

I cannot access JPRT.
So I need a sponsor.


Thanks,

Yasumasa