Update the limestone cert in our clouds.yaml

Limestone has updated their self signed cert and in order to properly
verify it we need to update the cert material to check against itself.

Maybe we should confirm with logan- that the new cert material looks
correct before landing this just to be sure we're trusting the correct
thing.

Change-Id: Id528716aecb45ffb263850f697c5fb22db3b7969

playbooks/roles/configure-openstacksdk/files/limestone_cacert.pem

@@ -1,23 +1,23 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----