[lldb] [test] Mark newly running test XFAIL on NetBSD

The test was not previously run due to decorator bug (fixed in r366903).
It is not a regression and is probably related to the other failing
test, so just disable it.

llvm-svn: 367285

lldb/packages/Python/lldbsuite/test/python_api/hello_world/TestHelloWorld.py

@@ -109,6 +109,7 @@ class HelloWorldTestCase(TestBase):
     @add_test_categories(['pyapi'])
     @skipIfiOSSimulator
     @skipIfSanitized # FIXME: Hangs indefinitely.
+    @expectedFailureNetBSD
     def test_with_attach_to_process_with_name_api(self):
         """Create target, spawn a process, and attach to it with process name."""
         exe = '%s_%d'%(self.getBuildArtifact(self.testMethodName), os.getpid())