NFSMount storage plugin for kubelet.

* If you want to test this out when an actual NFS export a good place
 to start is by running the NFS server in a container:

docker run -d --name nfs --privileged cpuguy83/nfs-server /tmp

More detail can be found here:
https://github.com/cpuguy83/docker-nfs-server

pkg/api/testing/fuzzer.go

@@ -167,7 +167,7 @@ func FuzzerFor(t *testing.T, version string, src rand.Source) *fuzz.Fuzzer {
 		func(vs *api.VolumeSource, c fuzz.Continue) {
 			// Exactly one of the fields should be set.
 			//FIXME: the fuzz can still end up nil.  What if fuzz allowed me to say that?
-			fuzzOneOf(c, &vs.HostPath, &vs.EmptyDir, &vs.GCEPersistentDisk, &vs.GitRepo, &vs.Secret)
+			fuzzOneOf(c, &vs.HostPath, &vs.EmptyDir, &vs.GCEPersistentDisk, &vs.GitRepo, &vs.Secret, &vs.NFS)
 		},
 		func(d *api.DNSPolicy, c fuzz.Continue) {
 			policies := []api.DNSPolicy{api.DNSClusterFirst, api.DNSDefault}