new pmiostat qa failures

[Ken McDonell <kenj@xxxxxxxxxxxxxxxx>]

I'm seeing this a lot for qa/536

...
## Testing pmiostat with disk.dev metrics
Traceback (most recent call last):
  File "/usr/bin/pmiostat", line 229, in <module>
    if not IostatOptions.checkOptions(manager):
TypeError: unbound method checkOptions() must be called with IostatOptions 
instance as first argument (got MetricGroupManager instance instead)
## Testing pmiostat with deice-mapper metrics
Traceback (most recent call last):
  File "/usr/bin/pmiostat", line 229, in <module>
    if not IostatOptions.checkOptions(manager):
TypeError: unbound method checkOptions() must be called with IostatOptions 
instance as first argument (got MetricGroupManager instance instead)

and something similar in qa/842 and qa/1099.