ensure test_no_kernels runs first

since it expects a clean notebook server.

IPython/html/services/kernels/tests/test_kernels_api.py

@@ -21,7 +21,7 b' class KernelAPITest(NotebookTestBase):'
         r = requests.post(self.base_url())
         return r.json()
 
-    def test_no_kernels(self):
+    def test__no_kernels(self):
         """Make sure there are no kernels running at the start"""
         url = self.base_url()
         r = requests.get(url)
@@ -51,4 +51,4 b' class KernelAPITest(NotebookTestBase):'
         r = requests.delete(url)
         self.assertEqual(r.status_code, 204)
         r = requests.get(self.base_url())
-        self.assertEqual(r.json(), [])
  No newline at end of file
+        self.assertEqual(r.json(), [])