[zenoss] employ ping down dependency to suppress other events

sum = str(evt.summary)
if getattr(evt, 'severity', 0) > 0 \
and getattr(evt, 'eventClass', '/Unknown') != '/Status/Ping' \
and device and device.getPingStatus() > 0:
       evt._action = "drop"

if (sum.find("Command timed out")>=0) \
or (sum.find("Socket timeout")>=0) \
or (sum.find("Unable to read")>=0) \
or (sum.find("Process not running")>=0) \
or (sum.find("SNMP agent down")>=0) \
or (sum.find("No response from")>=0):
     if device.getPingStatus() <= 0:
           time.sleep(8)
           if device.getPingStatus() > 0:
                  evt._action = "drop"
     else:
           evt._action = "drop"

   if getattr(evt, 'prodState', 99)<400:
      evt._action = "drop"