livy interpreter does not honour impersonation

On one webUI run Zeppelin and log in as userA.
On another webUI run Zeppelin and log in as userB.
From the zeppelin UI logged in as userA run:
%livy.spark
sc.sparkUser
This starts a job in RM UI as userA and the output from the above query is: userA
Now, go to the zeppelin UI where you are logged in as userB. This session uses the same job created by userA and the output of the query in that session is also userA.
If you start running the query as userB, the job will start as userB and userA will see userB as the output from its query.
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