Turn selected logging messages to "debug".

Otherwise, they interfere with the output of `machine url` and `machine ls`. `machine url`
is more important because it breaks the export statement to configure docker if it includes
additional output.

Signed-off-by: Ash Wilson <ash.wilson@rackspace.com>

drivers/rackspace/client.go

@@ -28,7 +28,7 @@ func (c *Client) Authenticate(d *openstack.Driver) error {
 
 	log.WithFields(log.Fields{
 		"Username": d.Username,
-	}).Info("Authenticating to Rackspace.")
+	}).Debug("Authenticating to Rackspace.")
 
 	apiKey := c.driver.APIKey
 	opts := gophercloud.AuthOptions{

drivers/rackspace/rackspace.go

@@ -92,7 +92,7 @@ func RegisterCreateFlags(cmd *flag.FlagSet) interface{} {
 func NewDriver(storePath string) (drivers.Driver, error) {
 	log.WithFields(log.Fields{
 		"storePath": storePath,
-	}).Info("Instantiating Rackspace driver.")
+	}).Debug("Instantiating Rackspace driver.")
 
 	client := &Client{}
 	inner, err := openstack.NewDerivedDriver(storePath, client)