RFR: JDK-8224159: JDWP IPv6 scope support

[Alex Menkov]

Hi all,

Please review the fix for
   https://bugs.openjdk.java.net/browse/JDK-8224159
webrev:
   http://cr.openjdk.java.net/~amenkov/jdk14/jdwp_scopes/webrev/

The change implements IPv6 symbolic scope support in JDWP agent.
Tested
   jdk/com/sun/jdi,open/test/hotspot/jtreg/vmTestbase/nsk/jdi
   hotspot/jtreg/vmTestbase/nsk/jdwp
   hotspot/jtreg/vmTestbase/nsk/jdb

--alex