Description of problem:
Adding negative value to resource quota yaml file while Setting Limits for Users and Projects: while creating quota where persistent volume claim given with negative values 
I could execute the command successfully without any error.

Version-Release number of selected component (if applicable):
atomic-openshift-utils-3.6.173.0.48-1.git.0.1609d30.el7.noarch

How reproducible:
resource-quota.yaml

apiVersion: v1
kind: ResourceQuota
metadata:
  name: core-object-counts
spec:
  hard:
    configmaps: "10"
    persistentvolumeclaims: "-4"
    replicationcontrollers: "20"
    secrets: "10"
    services: "10"


Steps to Reproduce:
1.login to Openshift CLI 
2.oc create -f resource-quota.yaml


Actual results:
It is successfully executing and creating quota.

Expected results:
It should throw the error after detecting the negative value

Additional info: