Error when processing addNetwork

**What happened**:
```
Error when processing addNetwork

The kuryr-controller has completed the creation of the kuryrport and updated the kuryrport CRD.
By looking at the kuryr-cni log, it looks like the kuryr-cni watcher process did not receive the update information for the kuryrport CRD, causing DaemonServer.run() return GATEWAY_TIMEOUT
```

**What you expected to happen**:
```
Normally, `kuryr-daemon: watcher worker` will `got CRD` of this kuryrport from apiserver, and it is certain that everything is fine with the current apiserver (because other nodes are able to create pods successfully).
```
**How to reproduce it (as minimally and precisely as possible)**:
```
I don't know how to reproduce the problem. But this problem has occurred a few times in my environment. Several times the problem has occurred after kuryr-cni has been running for a long time
```

**Environment**:
- Kubernetes version:
`v1.14.3`
- Kuryr-Kubernetes version:
`stable/train`
- Openstack version:
`stable/Rocky`

- Cluster information:
```
NAME STATUS ROLES AGE VERSION
master-0 Ready l3-node,master,monitor,node,openvswitch 47d v1.14.3
master-1 Ready l3-node,master,node,openstack-compute,openvswitch 47d v1.14.3
master-2 Ready l3-node,master,node,openvswitch 47d v1.14.3
slave-0 Ready l3-node,node,openvswitch 23d v1.14.3

NAME READY STATUS RESTARTS AGE IP NODE
kuryr-cni-ds-bngz6 1/1 Running 10 16d 192.168.15.86 master-1
kuryr-cni-ds-c7zp7 1/1 Running 1 16d 192.168.15.93 master-2
kuryr-cni-ds-cww29 1/1 Running 0 16d 192.168.15.91 master-0
kuryr-cni-ds-xz688 1/1 Running 0 7h53m 192.168.15.100 slave-0
kuryr-controller-5c964f789f-ndpk6 1/1 Running 1 6h19m 192.168.15.91 master-0
```
**Anything else we need to know?**:
```
nginx-5b98f4fcf8-bcsgk 0/1 ContainerCreating 0 12m <none> master-0 <none> <none>

---
apiVersion: openstack.org/v1
kind: KuryrPort
metadata:
  creationTimestamp: "2020-12-23T10:48:11Z"
  finalizers:
  - kuryr.openstack.org/kuryrport-finalizer
  generation: 3
  labels:
    kuryr.openstack.org/nodeName: master-0
  name: nginx-5b98f4fcf8-bcsgk
  namespace: default
  resourceVersion: "9924655"
  selfLink: /apis/openstack.org/v1/namespaces/default/kuryrports/nginx-5b98f4fcf8-bcsgk
  uid: 59fd71fc-450c-11eb-9ac9-fa163ebaf135
spec:
  podNodeName: master-0
  podUid: 55b97114-450c-11eb-9bab-fa163e903454
status:
  projectId: adfb76685924419a88d92d768c3d7bd1
  vifs:
    eth0:
      default: true
      vif:
        versioned_object.data:
          active: true
          address: fa:16:3e:5f:99:ba
          bridge_name: br-int
          has_traffic_filtering: false
          id: e0f04a15-c8e0-4a2d-9bc5-9ee6a041e221
...
---
apiVersion: v1
kind: Pod
metadata:
  annotations:
    routerId: 81760e19-4c4e-41c5-9c5f-ef18b832496b
  creationTimestamp: "2020-12-23T10:48:04Z"

---
kuryr-cni.log
DEBUG kuryr_kubernetes.cni.daemon.service [-] Received ADD request. CNI Params: {'CNI_IFNAME': 'eth0', 'CNI_NETNS': '/proc/3401884/ns/net', 'CNI_PATH': '/opt/cni/bin', 'CNI_COMMAND': 'ADD', 'CNI_CONTAINERID': 'fa15ea5d899657d48ee8759a5cb2c1e63f7995b85bd2187a53ec179195df293a', 'CNI_ARGS': 'IgnoreUnknown=1;K8S_POD_NAMESPACE=default;K8S_POD_NAME=nginx-5b98f4fcf8-bcsgk;K8S_POD_INFRA_CONTAINER_ID=fa15ea5d899657d48ee8759a5cb2c1e63f7995b85bd2187a53ec179195df293a'} _prepare_request /usr/local/lib/python3.6/site-packages/kuryr_kubernetes/cni/daemon/service.py:70
DEBUG oslo_concurrency.lockutils [-] Acquired lock "default/nginx-5b98f4fcf8-bcsgk" lock /usr/local/lib/python3.6/site-packages/oslo_concurrency/lockutils.py:266
DEBUG oslo_concurrency.lockutils [-] Acquired external semaphore "default/nginx-5b98f4fcf8-bcsgk" lock /usr/local/lib/python3.6/site-packages/oslo_concurrency/lockutils.py:273
DEBUG oslo_concurrency.lockutils [-] Releasing lock "default/nginx-5b98f4fcf8-bcsgk" lock /usr/local/lib/python3.6/site-packages/oslo_concurrency/lockutils.py:282
ERROR kuryr_kubernetes.cni.daemon.service [-] Error when processing addNetwork request: kuryr_kubernetes.exceptions.ResourceNotReady: Resource not ready: 'default/nginx-5b98f4fcf8-bcsgk'
```