Delete pod if subnet of the pod's owner(sts/vm) updated

[chestack]

What type of this PR

• Bug fixes

Which issue(s) this PR fixes:

Fixes #1677

[chestack]

@hongzhen-ma cloud you please help review this change, found that you did much work about sts pods deletion from the git history. thanks

[hongzhen-ma]

@hongzhen-ma cloud you please help review this change, found that you did much work about sts pods deletion from the git history. thanks

It looks good to me. Thanks for the PR. @chestack

[hongzhen-ma]

@chestack It seems that e2e should be modified to adapt.

[chestack]

@chestack It seems that e2e should be modified to adapt.

e2e helped to find out the missing condition ownerRefSubnet != ""

// subnet of ownerReference(sts/vm) has been changed, it needs to handle delete pod and create port on the new logical switch
-       if podSubnet != nil && podSubnet.Name != ownerRefSubnet {
+       if podSubnet != nil && ownerRefSubnet != "" && podSubnet.Name != ownerRefSubnet {
                klog.Infof("Subnet of owner %s has been changed from %s to %s, delete pod %s/%s", ownerRefName, podSubnet.Name, ownerRefSubnet, pod.Namespace, pod.Name)
                return true, nil
        }