make test: fix/disable VAPI tests on centos

Workaround old `check' library on centos.
Disable building/running of C++ VAPI test as centos's gcc can't compile
our C++ code (vapi.hpp) due to bug.

Change-Id: If9da9c7f1bc076f7cdfb9bd3016dfe60a08afa36
Signed-off-by: Klement Sekera <ksekera@cisco.com>

test/test_vapi.py

@@ -8,7 +8,8 @@ import signal
 import subprocess
 from threading import Thread
 from log import single_line_delim
-from framework import VppTestCase, running_extended_tests, VppTestRunner
+from framework import VppTestCase, running_extended_tests, \
+    running_on_centos, VppTestRunner
 
 
 class Worker(Thread):
@@ -73,6 +74,7 @@ class VAPITestCase(VppTestCase):
                 "Timeout! Worker did not finish in %ss" % timeout)
         self.assert_equal(worker.result, 0, "Binary test return code")
 
+    @unittest.skipIf(running_on_centos(), "Centos's gcc can't compile our C++")
     def test_vapi_cpp(self):
         """ run C++ VAPI tests """
         var = "BR"