[sql-15] sessions: activate normal sessions in one go & add various functional options for NewSession #984
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In this commit, we let StateReserved be the new initial state of a session for when NewSession is called. We then do predicate checks for linked sessions along with unique session alias (ID) and priv key derivations all under the same DB transaction in NewSession. CreateSession then moves a session to StateCreated. Only in StateCreated does a session become usable. With this change, we no longer need to ensure atomic session creation by acquiring the `sessRegMu` mutex in the session RPC server.
This was used to check that all linked sessions are no longer active before attempting to register an autopilot session. But this is no longer needed since this is done within NewSession.
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As a follow up to #980, here we add a functional option for immediate session activation (ie, skip
Reservedstate and go straight toCreated) for normal, non-autopilot sessions.We also take the opportunity for some interface clean-up and convert a bunch of the NewSession parameters to functional ops.
TODO(elle): unit test for immediateActivate option