Incorrect user is picked up by Zeppelin during relogin after Knox SSO token expiry

Steps to reproduce :
1) Enable SSO for zeppelin
2) Keep the token expiry time to small value say 5secs.
3) Login using user "user1"
4) After 5secs, check that user is logged out due to token expiry
5) Now try to login with different user "user2"
6) Still zeppelin is picking up older user "user1"