adopt: import rgw ssl certificate into kv store

adopt: import rgw ssl certificate into kv store

Without this, when rgw is managed by cephadm, it fails to start because
the ssl certificate isn't present in the kv store.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1987010
Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1988404
Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>
Co-authored-by: Dimitri Savineau <dsavinea@redhat.com>
(cherry picked from commit 930fc4c8500b62d6fbf487a172e6da5b9b54cb86)
(cherry picked from commit 6e9cf807479045b730dee7cb5a5996a11948d302)