Description of problem:
When created 3 sriovnetworknodepolicies with same priority, the sriov device plugin pod always recreated

Version-Release number of selected component (if applicable):
quay.io/openshift-release-dev/ocp-v4.0-art-dev:v4.2.0-201908192219-ose-sriov-network-operator
quay.io/openshift-release-dev/ocp-v4.0-art-dev:v4.2.0-201908181300-ose-sriov-network-config-daemon
quay.io/openshift-release-dev/ocp-v4.0-art-dev:v4.2.0-201908192219-ose-sriov-network-device-plugin

How reproducible:
always

Steps to Reproduce:
1. install the sriov operator
2. Create 3 sriovnetworknodepolicies with same priority
  
    #oc get sriovnetworknodepolicies policy-intel -o yaml
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  creationTimestamp: "2019-08-22T08:20:21Z"
  generation: 1
  name: policy-intel
  namespace: sriov-network-operator
  resourceVersion: "2840593"
  selfLink: /apis/sriovnetwork.openshift.io/v1/namespaces/sriov-network-operator/sriovnetworknodepolicies/policy-intel
  uid: aecd8d1a-c4b5-11e9-a6ef-3cfdfeba0aa4
spec:
  deviceType: vfio-pci
  mtu: 1500
  nicSelector:
    pfNames:
    - ens1f0
    rootDevices:
    - 0000:3b:00.0
    vendor: "8086"
  nodeSelector:
    feature.node.kubernetes.io/sriov-capable: "true"
  numVfs: 6
  priority: 99
  resourceName: intelnics2

 apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  creationTimestamp: "2019-08-22T08:14:57Z"
  generation: 4
  name: policy-mt
  namespace: sriov-network-operator
  resourceVersion: "3205470"
  selfLink: /apis/sriovnetwork.openshift.io/v1/namespaces/sriov-network-operator/sriovnetworknodepolicies/policy-mt
  uid: ee0e4be5-c4b4-11e9-a6ef-3cfdfeba0aa4
spec:
  deviceType: vfio-pci
  mtu: 1500
  nicSelector:
    pfNames:
    - ens3f0
    rootDevices:
    - 0000:5e:00.0
    vendor: 15b3
  nodeSelector:
    feature.node.kubernetes.io/sriov-capable: "true"
  numVfs: 2
  priority: 99
  resourceName: mtnics

# oc get sriovnetworknodepolicies policy-mt28 -o yaml
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  creationTimestamp: "2019-08-23T04:03:54Z"
  generation: 4
  name: policy-mt28
  namespace: sriov-network-operator
  resourceVersion: "3205471"
  selfLink: /apis/sriovnetwork.openshift.io/v1/namespaces/sriov-network-operator/sriovnetworknodepolicies/policy-mt28
  uid: 06428fda-c55b-11e9-9801-3cfdfeba0aa4
spec:
  deviceType: vfio-pci
  mtu: 1500
  nicSelector:
    pfNames:
    - ens2f0
    rootDevices:
    - 0000:60:00.0
    vendor: 15b3
  nodeSelector:
    feature.node.kubernetes.io/sriov-capable: "true"
  numVfs: 6
  priority: 99
  resourceName: mt28nics
3. Check the sriov device plugin pod 

Actual results:

sriov device plugin pod always recreated

Expected results:

sriov device plugin pod work well.

Additional info:

when using different priority, no this issue.