Implement acceptance tests. Those jobs will run in the post-review
pipeline requiring access to secrets containing credentials of friendly
public clouds to test sdk with them.
Base job is generating a token from the given credentials and writes
clouds.yaml file with the token inside instead of password. As a post
step the token is physically revoked. This is done to prevent potential
leakage of real credentials from the test jobs/logs.
Since devstack is not a real cloud we do not use zuul secrets.
Change-Id: I95af9b81e6abd51af2a7dd91cae14b56926a869c
43ab59d8b3