Updated openstack/openstack
Project: openstack-dev/devstack  5710853b62fbdfa0c59dba14001620331be9a2bf
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Use sahara.conf.sample instead of old one

Sahara internals was updated, now we can use correct conf sample.

Change-Id: Ia8d99c2742785c3b5c724617a5dfc2880624a03f