RFR 8031195: Support default and static interface methods in JDI, JDWP and JDB

[Jaroslav Bachorik]

Please, review the following patch:

Issue : https://bugs.openjdk.java.net/browse/JDK-8031195
Webrev: http://cr.openjdk.java.net/~jbachorik/8031195/webrev.04

With JDK8 it became possible to have methods with implementation in 
interfaces - static and default interface methods. However the JDI and 
JDWP were not updated to reflect these capabilities so it is not 
currently possible to invoke a static or default interface method 
programatically from the debugger.

This patch adds support for static and default interface methods to JDI, 
JDWP and JDB.

Thanks,

-JB-