create_namespaced_binding() method shows target.name: Required value

When calling the API create_namespaced_binding() method like so:

```
config.load_kube_config()
v1 = client.CoreV1Api()
v1.create_namespaced_binding(namespace, body)
```

The following error is thrown:

```
Exception when calling CoreV1Api->create_namespaced_binding: (500)
Reason: Internal Server Error
HTTP response headers: HTTPHeaderDict({'Content-Type': 'application/json', 'Date': 'Wed, 06 Jun 2018 20:55:04 GMT', 'Content-Length': '120'})
HTTP response body: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"target.name: Required value","code":500}
```
Also when I use `body = client.V1Binding()` following error is thrown:
```
File "/usr/lib/python2.7/site-packages/kubernetes/client/models/v1_binding.py", line 64, in __init__
self.target = target
File "/usr/lib/python2.7/site-packages/kubernetes/client/models/v1_binding.py", line 156, in target
raise ValueError("Invalid value for `target`, must not be `None`")
ValueError: Invalid value for `target`, must not be `None`
```
Environment is:

```
Both Python 2.7 and Python 3.6
Metadata-Version: 2.1
Name: kubernetes
Version: 6.0.0
```

**Full code for the custom scheduler**
```
from kubernetes import client, config, watch
from kubernetes.client.rest import ApiException
config.load_kube_config()
v1 = client.CoreV1Api()

scheduler_name = 'custom-scheduler-test'

def nodes_available():
ready_nodes = []
for n in v1.list_node().items:
for status in n.status.conditions:
if status.status == 'True' and status.type == 'Ready':
ready_nodes.append(n.metadata.name)
return ready_nodes

def scheduler(name, node, namespace='default'):
body = client.V1ConfigMap()
# or this # body = client.V1Binding()
target = client.V1ObjectReference()
target.kind = 'Node'
target.apiVersion = 'v1'
target.name = node
meta = client.V1ObjectMeta()
meta.name = name
body.target = target
body.metadata = meta
return v1.create_namespaced_binding(namespace, body)

def main():
w = watch.Watch()
for event in w.stream(v1.list_namespaced_pod, 'default'):
if event['object'].status.phase == 'Pending' and event['object'
].spec.scheduler_name == scheduler_name:
try:
res = scheduler(event['object'].metadata.name,random.choice(nodes_available()))
except ApiException as e:
print ("Exception when calling CoreV1Api->create_namespaced_binding: %s\n" % e)

if __name__ == '__main__':
main()
```

Start with the reported create_namespaced_binding() call and the generated client/models/v1_binding.py model, then run the supplied custom-scheduler reproduction on the reported Python versions. Compare the required target and metadata values with the API request and confirm that the binding call completes without the target.name error.

Written by the indexing model from the issue text.