before managing mgr modules, we must ensure all mgr are available
otherwise we can hit failure like following:
```
stdout:Error ENOENT: all mgr daemons do not support module 'restful', pass --force to force enablement
```
It happens because all mgr are not yet available when trying to manage
with mgr modules.
Closes: #3100
Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>
(cherry picked from commit f596cc1711)
This commit removes the default module, so ceph-ansible does not enable
any manager module.
To enable a module you need to set a value to 'ceph_mgr_modules', you
can pass a list of modules like this:
ceph_mgr_modules:
- status
- dashboard
Signed-off-by: Sébastien Han <seb@redhat.com>