Update test_xcpp_kernel.py

Author: mcbarton

test/test_xcpp_kernel.py

@@ -229,6 +229,8 @@ class BaseXCppTests2(jupyter_kernel_test.KernelTests):
     class BaseXCppOpenMPTests(jupyter_kernel_test.KernelTests):
         __test__ = False
 
+        kernel_name = 'dummy_name'
+
         # language_info.name in a kernel_info_reply should match this
         language_name = 'C++' if 'xcpp' in kernel_name else 'c'