Remove validate action and notario dependency

Remove validate action and notario dependency

The current ceph-validate role is using both validate action and fail
module tasks to validate the ceph configuration.
The validate action is based on the notario python library. When one of
the notario validation fails then a python stack trace is reported to the
ansible task. This output isn't understandable by users.

This patch removes the validate action and the notario depencendy. The
validation is now done with only fail ansible module.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1654790
Signed-off-by: Dimitri Savineau <dsavinea@redhat.com>