RFR JDK-8211292: [TEST] convert com/sun/jdi/DeferredStepTest.sh test

[Alex Menkov]

Hi all,

please review a fix for
https://bugs.openjdk.java.net/browse/JDK-8211292
webrev:
http://cr.openjdk.java.net/~amenkov/sh2java/DeferredStep_final/webrev/

The fix converts manual shell test to automatic java (as Java allows to 
parse jdb replies much easier).
This is the last sub-task for the "shell to java conversion" task, so 
the fix also removes shared shell scripts.

--alex