Description of problem:
Resource requirement request for cpu can exceed the limit, while
resource requirement request for memory can not.


Version-Release number of selected component (if applicable):
Client Version: version.Info{Major:"1", Minor:"1+", GitVersion:"v1.1.0-alpha.1.362+2e2def36a904fe-dirty", GitCommit:"2e2def36a904fe9a197da5fc70e433e2e884442f", GitTreeState:"dirty"}
Server Version: version.Info{Major:"1", Minor:"1+", GitVersion:"v1.1.0-alpha.1.362+2e2def36a904fe-dirty", GitCommit:"2e2def36a904fe9a197da5fc70e433e2e884442f", GitTreeState:"dirty"}


How reproducible:
Always


Steps to Reproduce:
1.Create a project.
$ kubectl create -f project.yaml

2.Set resource limit for the project.
$ kubectl create -f limits.yaml -n <project-name>

3.Check the detail of the project
$ kubectl describe project <project-name>

Actual results:
When defaultRequest memory exceed the limit, creation of resource limit will fail with following error:
spec.limits[0].defaultRequest[memory]: invalid value '134217728', Details: default request value 128Mi is greater than default limit value 100Mi

But when defaultRequest cpu exceed the limit, no such kind of error and the resource limit created successfully.
# kubectl describe namespace namespace-demo
Name:    namespace-demo
Labels:    name=namespace-demo
Status:    Active
Resource Limits
 Type        Resource    Min    Max    Request    Limit    Limit/Request
 ----        --------    ---    ---    -------    -----    -------------
 Pod        cpu        10m    500m    60m    100m    -
 Pod        memory        5Mi    750Mi    64Mi    100Mi    -
 Container    cpu        10m    500m    120m    100m    -
 Container    memory        5Mi    750Mi    64Mi    100Mi    -
 Project    cpu        10m    500m    120m    100m    -
 Project    memory        5Mi    750Mi    64Mi    100Mi    -


Expected results:
The creation of resource limit should fail if either cpu or memory's request exceed the limit.


Additional info:
$ cat limits.yaml
apiVersion: v1
kind: LimitRange
metadata:
  name: limits
spec:
  limits:
  - type: Pod
    default:
      cpu: 100m
      memory: 100Mi
    max:
      cpu: 500m
      memory: 750Mi
    min:
      cpu: 10m
      memory: 5Mi
    defaultRequest:
      cpu: 60m
      memory: 64Mi
  - type: Container
    default:
      cpu: 100m
      memory: 100Mi
    max:
      cpu: 500m
      memory: 750Mi
    min:
      cpu: 10m
      memory: 5Mi
    defaultRequest:
      cpu: 120m
      memory: 64Mi
  - type: Project
    default:
      cpu: 100m
      memory: 100Mi
    max:
      cpu: 500m
      memory: 750Mi
    min:
      cpu: 10m
      memory: 5Mi
    defaultRequest:
      cpu: 120m
      memory: 64Mi