defaults: fix rgw restart script in handlers

defaults: fix rgw restart script in handlers

Like 80d32dec, the path to the fact is not correct.
In any case, we will retrieve the IP address in hostvars, the variable
is the way we get the interface name according where it has been set
(eg.: inventory host file vs. group_vars/)

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1510906
Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>
(cherry picked from commit 44df3f9102773c10011c82b5c1a20e7ae46e0001)
Signed-off-by: Sébastien Han <seb@redhat.com>