Add API client for Azure custom vnet (#271)

* Update vendor for azure vent support

* Add support for Azure custom vnets.

Use pointers intead of values. This allows the client to pass back
returned data from Azure.

providers/azure/client/network/profile.go

@@ -0,0 +1,149 @@
+package network
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"net/url"
+
+	"github.com/pkg/errors"
+	"github.com/virtual-kubelet/virtual-kubelet/providers/azure/client/api"
+)
+
+const (
+	profilePath = "subscriptions/{{.subscriptionId}}/resourcegroups/{{.resourceGroupName}}/providers/Microsoft.Network/networkProfiles/{{.profileName}}"
+)
+
+// Profile represents an Azure network profile
+type Profile struct {
+	Name       string
+	ID         string
+	ETag       string `json:"etag"`
+	Type       string
+	Location   string
+	Properties ProfileProperties
+}
+
+// ProfileProperties stores the properties for network profiles
+type ProfileProperties struct {
+	ContainerNetworkInterfaceConfigurations []InterfaceConfiguration
+}
+
+// InterfaceConfiguration is a configuration for a network interface
+type InterfaceConfiguration struct {
+	Name       string
+	Properties InterfaceConfigurationProperties
+}
+
+// InterfaceConfigurationProperties is the properties for a network interface configuration
+type InterfaceConfigurationProperties struct {
+	IPConfigurations []IPConfiguration
+}
+
+// IPConfiguration stores the configuration for an IP on a network profile
+type IPConfiguration struct {
+	Name       string
+	Properties IPConfigurationProperties
+}
+
+// IPConfigurationProperties stores the subnet for an IP configuration
+type IPConfigurationProperties struct {
+	Subnet ID
+}
+
+// ID is a generic struct for objets with an ID
+type ID struct {
+	ID string
+}
+
+// GetProfile gets the network profile with the provided name
+func (c *Client) GetProfile(resourceGroup, name string) (*Profile, error) {
+	urlParams := url.Values{
+		"api-version": []string{apiVersion},
+	}
+
+	// Create the url.
+	uri := api.ResolveRelative(baseURI, profilePath)
+	uri += "?" + url.Values(urlParams).Encode()
+
+	// Create the request.
+	req, err := http.NewRequest("GET", uri, nil)
+	if err != nil {
+		return nil, errors.Wrap(err, "creating network profile get uri request failed")
+	}
+
+	// Add the parameters to the url.
+	if err := api.ExpandURL(req.URL, map[string]string{
+		"subscriptionId":    c.auth.SubscriptionID,
+		"resourceGroupName": resourceGroup,
+		"profileName":       name,
+	}); err != nil {
+		return nil, errors.Wrap(err, "expanding URL with parameters failed")
+	}
+
+	// Send the request.
+	resp, err := c.hc.Do(req)
+	if err != nil {
+		return nil, errors.Wrap(err, "sending get network profile request failed")
+	}
+	defer resp.Body.Close()
+
+	// 200 (OK) is a success response.
+	if err := api.CheckResponse(resp); err != nil {
+		return nil, err
+	}
+
+	// Decode the body from the response.
+	if resp.Body == nil {
+		return nil, errors.New("get network profile returned an empty body in the response")
+	}
+	var p Profile
+	if err := json.NewDecoder(resp.Body).Decode(&p); err != nil {
+		return nil, errors.Wrap(err, "decoding get network profile response body failed")
+	}
+	return &p, nil
+}
+
+// CreateOrUpdateProfile creates or updates an Azure network profile
+func (c *Client) CreateOrUpdateProfile(resourceGroup string, p *Profile) error {
+	urlParams := url.Values{
+		"api-version": []string{apiVersion},
+	}
+
+	// Create the url.
+	uri := api.ResolveRelative(baseURI, profilePath)
+	uri += "?" + url.Values(urlParams).Encode()
+
+	// Create the request.
+	b, err := json.Marshal(p)
+	if err != nil {
+		return errors.Wrap(err, "marshalling networking profile failed")
+	}
+
+	req, err := http.NewRequest("PUT", uri, bytes.NewReader(b))
+	if err != nil {
+		return errors.Wrap(err, "creating network profile create uri request failed")
+	}
+
+	// Add the parameters to the url.
+	if err := api.ExpandURL(req.URL, map[string]string{
+		"subscriptionId":    c.auth.SubscriptionID,
+		"resourceGroupName": resourceGroup,
+		"profileName":       p.Name,
+	}); err != nil {
+		return errors.Wrap(err, "expanding URL with parameters failed")
+	}
+
+	// Send the request.
+	resp, err := c.hc.Do(req)
+	if err != nil {
+		return errors.Wrap(err, "sending get network profile request failed")
+	}
+	defer resp.Body.Close()
+
+	// 200 (OK) is a success response.
+	if err := api.CheckResponse(resp); err != nil {
+		return err
+	}
+	return errors.Wrap(json.NewDecoder(resp.Body).Decode(p), "error decoding network profile create response")
+}