[API-424] Do not allow concurrent requests on SessionManager for the same group id #904
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We should make sure that for the same group id, new create session requests
should only be made if there is no session or the session is expired.
To achieve this, a new Map that holds the group id to in-flight
create session requests pairs is introduced. When an in-flight request
is found for a group id, concurrent requests now wait for the initial
request to complete (either normally or exceptionally) and then try
again.
Closes #898