Gets rid of the following IPDB warning

WARNING pyroute2.ipdb.main [-] shutdown in progress

Change-Id: Ic5d9e3433fd7f25370bc622e77201b99808f11a6
Signed-off-by: Nayan Deshmukh <n.deshmukh@samsung.com>

kuryr_kubernetes/cni/health.py

@@ -127,8 +127,8 @@ class CNIHealthServer(object):
         data = 'ok'
         no_limit = -1
         try:
-            with IPDB() as a:
-                a.release()
+            with IPDB():
+                pass
         except Exception:
             error_message = 'IPDB not in working order.'
             LOG.error(error_message)