Adjustment done with a state machine, described below. Time timeout on
  'fping' is proportional to the desired testing rate while in this
  "outage mode".

- Bugfixes for running in an E-lab exp


state transitions
CurrentState   Input                 NextState
----------------------------------------------
normal         gotErr&PrevSucc       highFreq
               else                  normal
highFreq       <60sec&ERR            highFreq
               >60sec&ERR            medFreq
               SUCCESS               outageEnd
medFreq        <10min&ERR            medFreq
               >10min&ERR            lowFreq
               SUCCESS               outageEnd
lowFreq        ERR                   lowFreq
               SUCCESS               outageEnd
outageEnd      <120sec&SUCCESS       outageEnd
               >120sec&SUCCESS       normal
               ERR                   highFreq