Revert "Remove useless duplication on GetSSHHostname"

This reverts commit b6462eb6d0.

Signed-off-by: David Gageot <david@gageot.net>

drivers/hyperv/hyperv.go

@@ -85,6 +85,10 @@ func (d *Driver) SetConfigFromFlags(flags drivers.DriverOptions) error {
 	return nil
 }
 
+func (d *Driver) GetSSHHostname() (string, error) {
+	return d.GetIP()
+}
+
 func (d *Driver) GetSSHUsername() string {
 	if d.SSHUser == "" {
 		d.SSHUser = "docker"