RFR(L): 8199256: [TESTBUG] Open source VM testbase runtime tests

[Mikhailo Seledtsov]

Please review this change that will open source VM Testbase Runtime 
tests. This group includes tests covering a variety of runtime 
functional areas: arraycopy, barrier, jni, threads, vtable and contented.

These tests have been used internally for a while, and are now being 
open sourced. Since this is not a creation of new tests, we would like 
to keep the changes during this review to a minimum required for open 
sourcing these tests, such as major issues and integration blockers. If 
you have other feedback regarding improvements to these tests, please 
file RFE(s), which will be addressed later in order of priority.

Here is what was done for this change:
   1. Moved the tests to OpenJDK repository preserving relative 
directory structure.
   2. Updated Copyright statements accordingly.
   3. Updated "@library" statements accordingly.
   4. Updated TEST.groups and Problem List
   5. Updated HotSpot test make file

   JBS:    https://bugs.openjdk.java.net/browse/JDK-8199256
   Webrev: http://cr.openjdk.java.net/~mseledtsov/8199256.01.open/

   Testing:
       1. Ran the following tests on open-only repository and build, 
using "make run-test"
          (Linux-x64)
          vmTestbase_vm_runtime
          All PASS

       2. Automated multip-platform test system (usual 4 platforms):
          - vmTestbase_vm_runtime
          - hs-tier{1,2}
          In progress

Thank you,
Misha