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Cbus leave operation. Destroy fiber for fiber pool. Issue #1274

Implement cpipe_destroy() and cbus_leave(). cpipe_destroy() flushes all
queued messages. Each cbus_endpoint counts the number of connected pipes
and doesn't leave the bus if there are connected pipes or unfetched messages.

cbus_join() returns an error instead of panic in case of a duplicate
endpoint.

Cbus sends a wakeup event into the corresponding endpoint when
disconnecting a pipe from it. On receiving the message, a fiber pool destroy
handler setups a destroy fiber and sleeps until all pipes are disconnected
from the corresponding endpoint and all scheduled work is done.
All idle fibers are woken up and destroyed.

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