fixing missing parameter exception for ex_add_access_config function

[pmoosh]

Missing nic parameter throws exception in gce.ex_add_access_config

stderr: Traceback (most recent call last):
  File "/Users/pmoosh/.ansible/tmp/ansible-tmp-1421538564.46-10999847043196/gce_setip.py", line 139, in <module>
    main(sys.argv[1:])
  File "/Users/pmoosh/.ansible/tmp/ansible-tmp-1421538564.46-10999847043196/gce_setip.py", line 128, in main
    gce.ex_add_access_config(node = my_instance, name = ACC_CNF_NM, nat_ip = item.address)
  File "/Users/pmoosh/src/apache-libcloud/libcloud/compute/drivers/gce.py", line 941, in ex_add_access_config
    self.connection.async_request(request, method='POST', data=config)
  File "/Users/pmoosh/src/apache-libcloud/libcloud/common/base.py", line 866, in async_request
    response = request(**kwargs)
  File "/Users/pmoosh/src/apache-libcloud/libcloud/common/google.py", line 669, in request
    *args, **kwargs)
  File "/Users/pmoosh/src/apache-libcloud/libcloud/common/base.py", line 736, in request
    response = responseCls(**kwargs)
  File "/Users/pmoosh/src/apache-libcloud/libcloud/common/base.py", line 119, in __init__
    self.object = self.parse_body()
  File "/Users/pmoosh/src/apache-libcloud/libcloud/common/google.py", line 267, in parse_body
    raise InvalidRequestError(message, self.status, code)
libcloud.common.google.InvalidRequestError: {'locationType': 'parameter', 'domain': 'global', 'message': 'Required parameter: networkInterface', 'reason': 'required', 'location': 'networkInterface'}

[Kami]

/cc @erjohnso

[erjohnso]

@pmoosh - Looks like params should only contain 'networkInterface' [https://cloud.google.com/compute/docs/reference/latest/instances/addAccessConfig]. The rest of the data goes into the body of the request (the config dict). I also don't see an explicit reference to attribute/param called accessConfig. Looks like the body should be,

{
  "kind": "compute#accessConfig",
  "type": string,
  "name": string,
  "natIP": string
}

And we don't need to set kind.

[erjohnso]

Thanks for this @pmoosh! After you remove the accessConfig, can you also squash your commits and then I'll go ahead and merge it in.