ceph-grafana: remove ipv6 brakets on wait_for
ceph-grafana: remove ipv6 brakets on wait_for

The wait_for ansible module doesn't support the backets on IPv6 address
so need to remove them.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1769710

Signed-off-by: Dimitri Savineau <a50a620e679eed14f4e99998b821cea8884cf228@redhat.com>

ceph/ceph-ansible,ceph/ceph-ansible