shanyu opened a new pull request #187:  LIVY-617: Livy session leak on Yarn 
when creating session duplicated names
   ## What changes were proposed in this pull request?
   When creating a session with duplicated name, instead of throw exception in 
SessionManager.register() method, we should stop the session. Otherwise the 
session driver process will keep running and end up creating a leaked Yarn 
   ## How was this patch tested?
   This is just a simple fix and verified with manual end to end test.

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