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iproto: introduce new iproto buffers rotation algorithm

RAW COMMIT

Now iproto connection can not work separately with input buffers
and output buffers. Furthermore, Tx thread can write in both
output buffers simultaneously and can not discard input buffer even
it is not needed any more, because in such a case corresponding
output buffer can be reset by IProto thread, when Tx thread
writes in it.

New IProto buffers rotation algorithm separates input and output
buffers and forbids simultaneous writing in both output buffers
by Tx thread. The IProto thread has own output buffer and Tx thread
has another one. When the IProto flushed its buffer, they are
rotated.

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