Automatic merge from submit-queue

Unit test for negative value of allocatable resources

Introduce unit test for checking resource quantities for kubelet's allocatable resources.

Covered values:

* negative quantity value: error expected
* invalid quantity unit: error expected
* valid quantity: error not expected

Running go test with -v, returned error are logged as well for more information:

```shell
=== RUN   TestValueOfAllocatableResources
--- PASS: TestValueOfAllocatableResources (0.00s)
    server_test.go:47: Returned err: "resource quantity for \"memory\" cannot be negative: -150G"
    server_test.go:47: Returned err: "unable to parse quantity's suffix"
PASS
ok          k8s.io/kubernetes/cmd/kubelet/app       0.020s
```