Retry on DCOSException. (#6028)
Retry on DCOSException. (#6028)

Summary:
Fixes TypeError: unsupported operand type(s) for |=: 'bool' and 'DCOSException'.

gsantovena/marathon,meln1k/marathon,meln1k/marathon,mesosphere/marathon,guenter/marathon,mesosphere/marathon,meln1k/marathon,gsantovena/marathon,meln1k/marathon,guenter/marathon,gsantovena/marathon,gsantovena/marathon,guenter/marathon,mesosphere/marathon,guenter/marathon,meln1k/marathon,mesosphere/marathon,mesosphere/marathon,gsantovena/marathon,guenter/marathon