Description of problem:
`oc patch --type=strategic` should prompt the required key's name when updating array element

Version-Release number of selected component (if applicable):
OCP v3.9.0-0.9.0
Seems it is server issue, because testing with oc v3.9.0-0.9.0 against server v3.9.0-0.8.0 can prompt the required key's name, as shown in below "[Note 1]"

How reproducible:
Always

Steps to Reproduce:
1. Create resource whose YAML has array, e.g.
$ oc create -f https://raw.githubusercontent.com/openshift-qe/v3-testfiles/master/services/multi-portsvc.json
$ oc create -f https://raw.githubusercontent.com/openshift-qe/v3-testfiles/master/deployment/rc-with-two-containers.yaml

2. Run `oc patch --type=strategic ...` (--type=strategic is by default)
a) $ oc patch svc multi-portsvc --type=strategic -p '
spec:
  ports:
  - targetPort: 441'

b) $ oc patch rc rctest -p='
spec:
  template:
    spec:
      containers:
      - resources:
          limits:
            memory: 258Mi'

Actual results:
2. It improves readability than before [Note 1], but it doesn't prompt the name of the required key's name to user
a) Output is:
The Service "multi-portsvc" is invalid: spec.ports: Required value
b) Output is:
The ReplicationController "rctest" is invalid: spec.template.spec.containers: Required value

* [Note 1] Before, the output is not good to read, but it can show the required key's name:
Error from server: map: map[targetPort:441] does not contain declared merge key: port

Expected results:
2. Should prompt the required key's name to user

Additional info: