Commits on Mar 3, 2022

1. Ensure that we shut down open exchanges when controller shuts down. …

   We already handled shutdown of any ongoing PASE bits.
   
   This PR adds two more things:
   
   1) Shutting down any ongoing CASE session establishment exchanges for
      which we are the initiator.  This is done by shutting down all the
      operational device proxies on our mCASESessionManager (since we own
      all of those anyway) and fixing operational device proxy
      shutdown/destruction to actually clean up the CASEClient if we're
      still in the middle of CASE establishment.
   
   2) Expiring the SecureSessions for our fabric, so that any still-open
      operational exchanges for those sessions get closed correctly (with
      a timeout).  This is needed because our client cluster APIs don't
      give us any way to cancel the operation (invoke, read, write, etc)
      and we need to make sure those get cleaned up when we shut down.
   
   In addition to that:
   
   * Reject wrong-fabric results in
     DeviceCommissioner::OnOperationalNodeResolved (due to buggy minimal
     mdns), so if we start sharing a CASESessionManager across
     controllers we will not be in a position where we are ending up with
     CASE sessions we create but can't tear down.
   * Fix CASE shutdown to not leave a dangling MRP entry after it shuts
     down the exchange.
   
   Fixes project-chip#15760

   

   bzbarsky-apple committed Mar 3, 2022
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