RFR(S): remove ExecuteInternalVMTests and VerboseInternalVMTests flags

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8213058/webrev.00/index.html
> 174 lines changed: 0 ins; 170 del; 4 mod; 

Hi all,

could you please review this small clean up which removes ExecuteInternalVMTests and VerboseInternalVMTests flags and related make targets and tests?

8177708[1-3] is to convert the last of internal vm tests, so the whole InternalVMTests can be removed.

JBS: https://bugs.openjdk.java.net/browse/JDK-8213058
webrev: http://cr.openjdk.java.net/~iignatyev//8213058/webrev.00/index.html

testing: tier1, build all regular platforms
[1] https://bugs.openjdk.java.net/browse/JDK-8177708
[2] http://cr.openjdk.java.net/~iignatyev//8177708/webrev.00/index.html
[3] http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2018-October/030633.html

Thanks,
-- Igor