RFR: initial set of tests for nestmates vm exploration

[Stas Smirnov]

Hello,

Please review this initial set of tests for nestmates vm exploration. 
This new tests cover basic runtime access checks in down->up direction 
in terms of nested classes and inheritance. There are going to be more 
tests to speedup runtime development of nestmates support.

webrev.00: http://cr.openjdk.java.net/~stsmirno/nestmates/webrev.00
Testing: RBT

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Best regards,
Stanislav