openshiftpods: fix delete_namespaced_pod arguments

This change prevents a TypeError when deleting pods:
  TypeError: delete_namespaced_pod() takes 3 positional arguments but 4 were given

Change-Id: I6d31af352e3151eb1bdef52472a4b0b5fa00ecd8

nodepool/driver/openshiftpods/provider.py

@@ -119,14 +119,8 @@ class OpenshiftPodsProvider(OpenshiftProvider):
             self.log.exception("%s: unknown pool" % server_id)
             return
         self.log.debug("%s: removing pod" % pod_name)
-        delete_body = {
-            "apiVersion": "v1",
-            "kind": "DeleteOptions",
-            "propagationPolicy": "Background"
-        }
         try:
-            self.k8s_client.delete_namespaced_pod(
-                pod_name, project_name, delete_body)
+            self.k8s_client.delete_namespaced_pod(pod_name, project_name)
             self.log.info("%s: pod removed" % server_id)
         except Exception:
             # TODO: implement better exception handling

nodepool/tests/unit/test_driver_openshiftpods.py

@@ -57,7 +57,7 @@ class FakeCoreClient(object):
                 phase = "Running"
         return FakePod
 
-    def delete_namespaced_pod(self, name, project, delete_body):
+    def delete_namespaced_pod(self, name, project):
         to_delete = None
         for pod in self.pods:
             if pod.metadata.name == name: