Add config_tempest

Build a Tempest config from external could configuration

Change-Id: I80016c1f03a7cfcb52250da63de0e96d5f94c4af
CA tests

Add some basic CA tests

Change-Id: Ia914a40bbfb33a6c0412b27d219aaac2e288f651
Merge branch 'cinder-backends' into dt-test
Merge branch 'add-pre-install' into dt-test
Merge branch 'reorder-stack.sh' into dt-test
Merge branch 'new-ceph-backend' into dt-test
Merge branch 'test-ca' into dt-test
Merge branch 'usb-prereq' into dt-test
Merge branch 'conf-tempest' into dt-test
Merge branch 'test-service-functions' into dt-test