use sudo instead of "as root"
use sudo instead of "as root"

Originally I thought that we should avoid sudo, but we decided to
reverse that decision and now we're standardizing on sudo everywhere.

See https://bugzilla.redhat.com/1202734, "Initialize Calamari (as
root) by running: calamari-ctl initialize -- Inconsistent message
provided b/w Doc and the CLI"

ceph/ice-setup