title: Relaunch login activity as first activity
body: <p>I have login activity which is launcher of my app</p>
  
  <p>when user logs in I'm finishing this activity</p>
  
  <p>But when users session expires I need to relaunch this activity and clear stack of activities</p>
  
  <p>Intent.FLAG_ACTIVITY_CLEAR_TOP works only if i'm not fifnishing login activity</p>
  
  <p>what should i do to get needed functionality</p>