Logout from spotify

[Dheenul]

In Android SDK we have a method to logout, what it does is it clears all the user data and disconnects Spotify, while in iOS, there is no such method. We have only disconnect, which only disconnects Spotify from my app. Because of this even though when user is changed in Spotify, it's not getting reflected in my app for the first time, it's get's reflected for the second time.