dashboard: copy self-signed generated crt to mons

dashboard: copy self-signed generated crt to mons

This commit makes the playbook copying self-signed generated certificate
to monitors.
When mons and mgrs are deployed on dedicated nodes the playbook will
fail when trying to import certificate and key files since they are
generated on mgrs whereas we try to import them from a monitor.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1846995
Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>