tests: restore vapi C++ test under Centos-8

tests: restore vapi C++ test under Centos-8

The Centos-7 compiler had problems with vapi_cpp_test.cpp.
The Centos-8 compiler does not.  This change adds back the test.

==============================================================================
VAPI test
==============================================================================
run C VAPI tests                                                     1.55 OK
run C++ VAPI tests                                                   0.44 OK

==============================================================================
TEST RESULTS:
     Scheduled tests: 2
      Executed tests: 2
        Passed tests: 2
==============================================================================

Type: test

Change-Id: Ic6a655ae99eb3ba0e73b7feef4436a0ca5fd92be
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>