Wait for block device to show up in task rbd.dev_create.
Wait for block device to show up in task rbd.dev_create.

ktdreyer/teuthology,SUSE/teuthology,SUSE/teuthology,robbat2/teuthology,SUSE/teuthology,yghannam/teuthology,dmick/teuthology,t-miyamae/teuthology,caibo2014/teuthology,dreamhost/teuthology,t-miyamae/teuthology,zhouyuan/teuthology,dmick/teuthology,ivotron/teuthology,robbat2/teuthology,yghannam/teuthology,ktdreyer/teuthology,dreamhost/teuthology,ceph/teuthology,dmick/teuthology,ceph/teuthology,zhouyuan/teuthology,michaelsevilla/teuthology,tchaikov/teuthology,ivotron/teuthology,tchaikov/teuthology,caibo2014/teuthology,michaelsevilla/teuthology