Add an insecure option for Keystone client

Change-Id: I05cea4c79ad89d2c55008ea0d7ba9eefa5908fa2
Closes-Bug: #1232437
(cherry picked from commit d48b4a3a4e5d0b80c3644844e0f1c8e3806c78d6)
cacert is not picked up correctly by alarm services

related to bug 1266472 which changes client to look only at os_cacert arg.
update alarm services to use just os_cacert as well.

Change-Id: Id28a0838330296fe030fa7c4a35a216dd3e64bad
Closes-Bug: #1266477
(cherry picked from commit 89f9b3049ac7a395c470f8d323b44e8128e5b1b2)
Merge "Add an insecure option for Keystone client" into stable/havana
Merge "cacert is not picked up correctly by alarm services" into stable/havana