When QEMU is executed in console mode without any external event sources,
main loop may sleep for a very long time. But in case of replay
there is another event source - event log.
This patch adds main loop notification when the vCPU loop has nothing
to do and main loop should process the inputs from the event log.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Message-Id: <159013007895.28110.2020104406699709721.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>