Comment 2 for bug 1699700

It seems the password specified by "--admin_pass" is treated as extra metadata and only saved in config drive. But if we explicitly put the admin_pass in the metadata via "--meta admin_pass=xxxx" or add metadata from the horizon page, this passwd will be saved both in config drive or meta service:
nova boot --availability-zone nova:node-12.domain.tld testVM-2012-3 --flavor 3 --nic net-id=3caca64b-22c4-42d4-9f04-1b693c98ce3b --meta admin_pass=testVM1pass --image win-server-2012

{"random_seed": "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", "uuid": "d93e8553-9b18-4e58-82bb-29a362bf73b8", "availability_zone": "nova", "hostname": "testvm-2012-3.novalocal", "launch_index": 0, "meta": {"admin_pass": "testVM1pass"}, "project_id": "dc533d1486f04421af54094f9020d0e2", "name": "testVM-2012-3"}