API Metrics : send context type, not context name

Signed-off-by: Guillaume Tardif <guillaume.tardif@docker.com>

api/client/client.go

@@ -44,10 +44,16 @@ func New(ctx context.Context) (*Client, error) {
 		return nil, err
 	}
 
-	return &Client{
-		backendType: cc.Type(),
+	client := NewClient(cc.Type(), service)
+	return &client, nil
+}
+
+// NewClient returns new client
+func NewClient(backendType string, service backend.Service) Client {
+	return Client{
+		backendType: backendType,
 		bs:          service,
-	}, nil
+	}
 }
 
 // GetCloudService returns a backend CloudService (typically login, create context)
@@ -61,6 +67,11 @@ type Client struct {
 	bs          backend.Service
 }
 
+// ContextType the context type associated with backend
+func (c *Client) ContextType() string {
+	return c.backendType
+}
+
 // ContainerService returns the backend service for the current context
 func (c *Client) ContainerService() containers.Service {
 	if cs := c.bs.ContainerService(); cs != nil {