Make sure report_interval is less than service_down_time

If service_down_time is less than report_interval, services will
routinely be considered down, because they report in too rarely.
Add check for service_down_time vs report_interval, if report_interval
is larger than service_down_time, automatically change
service_down_time to be report_interval * 2.5

DocImpact

Closes bug #1255685

Change-Id: I9b291669ea201321b03a48d2a132810f3bace2dc
Switch create volume commands to Taskflow 0.1.1

- Old TaskFlow code was removed from Cinder.

- TaskFlow 0.1.1 was added to Cinder requirements.

- Create volume flows for volume.api, volume.manager and
  scheduler.manager were updated to use taskFlow 0.1.1

Partially implements: blueprint create-volume-flow
Change-Id: Idbac8d001436f02978b366fbb3205ce84c847267
Merge "Make sure report_interval is less than service_down_time"
Merge "Switch create volume commands to Taskflow 0.1.1"