[201811 xcvrd] state machine enhancement #45
Merged
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backport PR #44 from master to 201811 branch
Enhance the state machine in order to overcome a possible platform temporarily fail/unavailable case
if the system recovered then transmit to NORMAL state again, if not recovered in a certain period, then exit.
the benefit of this change is that when the system has error/failed temporarily, xcvrd can survive and recover instead of exit directly, make to more tolerance to errors.