tarantool / tarantool / 8817

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travis-ci

xrow: enable to encode SYNC in xrow

The xrow_encode_header ignores SYNC, because we do not want store it
on disk. But also xrow_header_encode is used by xrow_to_iovec, which is
used by coio_write_xrow, which writes xrows to the network subscribers.

And responses to these subscribers do not contain SYNC because of
xrow_header_encode usage.

Add flag to the xrow_header_encode and rename it to xrow_header_encode_impl
to allow encode SYNC.

Closes #2334

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