RFR: JDK-8244703: "platform encoding not initialized" exceptions with debugger, JNI

[Alex Menkov]

Hi all,

please review the fix for
https://bugs.openjdk.java.net/browse/JDK-8244703
webrev:
http://cr.openjdk.java.net/~amenkov/jdk15/jdwp_javalib_dep/webrev/

The issue is a regression from JDK-8222529 which introduced dependency 
jdwp lib of java lib.
The fix removes the dependency and implements platform to utf8 
conversion using existing jdwp code.

--alex