volume id is always none when getting retry parameter in scheduler

[TommyLike]

This below is the scheduler log when trying to reschedule create volume requests.
```
Apr 21 17:23:53 ecs-ecff-0001 cinder-scheduler[1128]: ERROR cinder.scheduler.flo
ws.create_volume [None req-7062c0db-0037-464e-971d-0094724ee104 admin None] Fail
ed to run task cinder.scheduler.flows.create_volume.ScheduleCreateVolumeTask;vol
ume:create: No valid backend was found. Exceeded max scheduling attempts 3 for v
olume None: NoValidBackend: No valid backend was found. Exceeded max scheduling
attempts 3 for volume None
Apr 21 17:23:53 ecs-ecff-0001 cinder-scheduler[1128]: DEBUG cinder.volume.flows.
common [None req-7062c0db-0037-464e-971d-0094724ee104 admin None] Setting Volume
 f865c458-cd0b-4f88-819a-01ec27b78d12 to error due to: No valid backend was foun
d. Exceeded max scheduling attempts 3 for volume None {{(pid=1128) error_out /op
t/stack/cinder/cinder/volume/flows/common.py:83}}
```