Updated openstack/openstack
Project: openstack/cinder  03bf403ed5d137707aeb381a9a8218a3e228f210
null
Change RBD delete failure log level to warn

This is a recoverable issue in the backend, so we don't have to provide
the message on the error level.

Change-Id: I35711876b2c088ad28f32abd39248dc9a467d00d
Closes-Bug: #1256259