_qemu_img_info in remotefs.py uses incorrect args

[Eric Harney]

https://opendev.org/openstack/cinder/src/commit/121d9f512b4a6d1afe6a690effb7c2b379040a7b/cinder/volume/drivers/remotefs.py#L1013

This line triggers a pylint warning because it's missing the volume_name parameter.

Refer to:

https://opendev.org/openstack/cinder/src/commit/121d9f512b4a6d1afe6a690effb7c2b379040a7b/cinder/volume/drivers/remotefs.py#L819

https://opendev.org/openstack/cinder/src/commit/121d9f512b4a6d1afe6a690effb7c2b379040a7b/cinder/volume/drivers/nfs.py#L541