Description of problem:

CNO doesn't validate Port argument for exportNetworkFlows.  In this case a parseInt overflow.


Version-Release number of selected component (if applicable):

4.8.0-0.nightly-2021-05-08-132247

How reproducible:

always


Steps to Reproduce:
1. oc apply the following YAML

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  exportNetworkFlows:
    netFlow:
      collectors:
        - 10.131.0.9:20561244234


Actual results:

We fail in ovnkube strconv.ParseInt due to overflow.   The openAPIV3Schema doesn't reject this because we don't limit the length of the port string in the regex  `:[0-9]+$`

F0511 02:31:18.414329  312944 ovnkube.go:130] netflow targets invalid: collector port 20561244234 is not a valid port: strconv.ParseInt: parsing "20561244234": value out of range



Expected results:

Invalid inputs are rejected, ideally no CrashLoopBackoffs.


Additional info: