Go: introducing SHM_ACK observer.

Each request processed in a separate goroutine. In case of OOSM state,
during response write, request goroutine blocks on channel which waits
event from main threa

Go: introducing SHM_ACK observer.

Each request processed in a separate goroutine. In case of OOSM state,
during response write, request goroutine blocks on channel which waits
event from main thread about SHM_ACK message from router.

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