Prevent read from closed stream.

`PageResultFrom` parses the response body as JSON, but the response returned
from `client.Post` is already parsed (and the response body has been closed).

rackspace/lb/v1/nodes/requests.go

@@ -119,10 +119,12 @@ func Create(client *gophercloud.ServiceClient, loadBalancerID int, opts CreateOp
 		return res
 	}
 
-	pr, err := pagination.PageResultFrom(resp)
-	if err != nil {
-		res.Err = err
-		return res
+	pr := pagination.PageResult{
+		Result: gophercloud.Result{
+			Body:   res.Body,
+			Header: resp.Header,
+		},
+		URL: *resp.Request.URL,
 	}
 
 	return CreateResult{pagination.SinglePageBase(pr)}