Description of problem: With no registry information (like registry-url, registry-username, registry-password) in bootstrap command, user must be warned with a message that registry details information is not provided, before bootstrap. This avoids to pull container images individually on every node, which required for building ceph cluster Version-Release number of selected component (if applicable): 5.1 How reproducible: Bootstrap a cluster without default registry information in bootstrap command Steps to Reproduce: 1.sudo cephadm bootstrap --mon-ip <mon_ip> or 2. With default image - sudo cephadm --image registry-proxy.engineering.redhat.com/rh-osbs/rhceph:ceph-5.0-rhel-8-containers-candidate-82880-20200915232213 bootstrap --mon-ip <mon_ip> Actual results: Bootstrap proceeds without giving user, a message or a warning that registry information is not provided Expected results:User should be notified with a warning to provide registry configuration information to pull container/ monitor stack images before bootstrap Additional info: