Code review request: JDK-8000692,Remove old KERNEL code

[Zhengyu Gu]

Hi,

This is a cleanup of kernel code, since it is already obsoleted - JDK7 
and JDK8 are no longer building kernel.

JBS: https://jbs.oracle.com/bugs/browse/JDK-8000692
Webrev: http://cr.openjdk.java.net/~zgu/8000692/webrev.00/

Tests:
  - JPRT
  - ute vm.quick.testlist on Linux x32.

Thanks,

-Zhengyu