This patch fixes shift=auto when record/replay is enabled.
Now user does not need to guess the best shift value.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>

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v2:
  moved icount_time_shift to vmstate subsection
Message-Id: <158988500050.15192.692077802469400393.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>