do not use update debian cache or try to install packages when package-install is...

do not use update debian cache or try to install packages when package-install is disabled

When deploying with --skip-tags=package-install (when there is no access to a repository), the playbook is still trying to update the package cache, or to install ceph-mgr packages, which makes the playbook fail.
This change prevents the playbook to try to update the cache or install ceph-mgr packages when the package-install tag is skipped.

Signed-off-by: Florent CARLI <florent.carli@rte-france.com>
(cherry picked from commit 271fd8294296efe42f4e4d98032b4f8aac8ff654)