tarantool / tarantool / 12519

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travis-ci

session: fix box.session.sync()

Before the patch box.session.sync() is global for the session and
is updated on each new iproto request. When the connection is
multiplexed, box.session.sync() can be changed with no finishing
a current request, if a new one arrives.

The patch makes box.session.push() local for the request,
protecting it from multiplexing mess. Box.session.sync() after
the patch can be safely used inside a request.

Closes #3450

@TarantoolBot document
Title: box.session.sync() became request local
Box.session.sync() was global for a session, so it was unusable
when the connection behind the session is multiplexed. Now
box.session.sync() is request local and can be safely used inside
the request processor.

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