There should be a way to rotate fernet keys

For a secure Fernet key rotation consider using HashiCorp Vault.
Use cases for configuration management tools are described here:
https://www.hashicorp.com/blog/using-hashicorp-vault-with-chef.html

Fix proposed to branch: master
Review: https://review.openstack.org/423234

Fix proposed to branch: master
Review: https://review.openstack.org/428055

Change abandoned by Dmitry Klenov (<email address hidden>) on branch: master
Review: https://review.openstack.org/423234
Reason: Abandoning due to decision to change implementation approach.
New review: https://review.openstack.org/#/c/428055/

Fix proposed to branch: master
Review: https://review.openstack.org/428074

Reviewed: https://review.openstack.org/428055
Committed: https://git.openstack.org/cgit/openstack/fuel-ccp/commit/?id=80447e7411fb446f6265d60bdc4c9d772fe15e0b
Submitter: Jenkins
Branch: master

commit 80447e7411fb446f6265d60bdc4c9d772fe15e0b
Author: Dmitry Klenov <email address hidden>
Date: Fri Jan 20 09:42:08 2017 +0000

    Secret support

    Support of k8s secrets is introduced. To create a secret, put
    an additional section 'secrets' to the definition
    of the service:

    secrets:
      name-for-reference:
        type: "Opaque"
        data:
          "file1": "some content"
          "file2": "another one"
        secret:
            secretName: name-in-k8s
        path: /where/to/mount

    You can reference to this secret from the container definition:

    daemon:
      secrets:
        - name-for-reference

    The referenced secret must be defined in the 'secrets' section.

    Change-Id: Iaaede4ccb94c99d70f3ecad040d5ab6c41428c5e
    Partial-Bug: #1651392
    Partial-Bug: #1651394

Reviewed: https://review.openstack.org/426092
Committed: https://git.openstack.org/cgit/openstack/fuel-ccp-keystone/commit/?id=f6a75158c2dd32720ed178d91ef2b6df40c6984a
Submitter: Jenkins
Branch: master

commit f6a75158c2dd32720ed178d91ef2b6df40c6984a
Author: Dmitry Klenov <email address hidden>
Date: Tue Jan 17 09:05:11 2017 +0000

    Fernet keys rotation action

    Mechanism to rotate fernet keys is added. CCP operator can use one
    of two ways to rotate keys:

    1. Manual rotation.
    Pre-generate keys manually and distribute them to keystone pod(s).
    To do it, operator needs to put generated keys to the ccp config file
    in the following format:

    configs:
        keystone:
            fernet_keys:
                "0": <key-0>
                "2": <key-2>
                "3": <key-3>

    Then, execute custom action 'fernet-rotate'. The keys will be placed
    to the k8s secret.

    2. Automatic rotation.
    Do not put keys to config, just execute 'fernet-rotate'. Keys will be
    automatically rotated and put to proper secret.

    Partial-Bug: #1651392
    Partial-Bug: #1651394
    Change-Id: I577b3f36a12d14b4b5d546d9633d4629eb5d8a37

Reviewed: https://review.openstack.org/428074
Committed: https://git.openstack.org/cgit/openstack/fuel-ccp-keystone/commit/?id=cef1b979ba6ca4dba34e815e860d28cc7f6440c6
Submitter: Jenkins
Branch: master

commit cef1b979ba6ca4dba34e815e860d28cc7f6440c6
Author: Dmitry Klenov <email address hidden>
Date: Fri Jan 27 07:08:58 2017 +0000

    Enable fernet keys generation

    This change effectively enables fernet keys generation and their
    usage via the mechanism of k8s secrets. Legacy approach with
    pre-generated fernet key is removed.

    Change-Id: Ibdf0a0eafb48930d5536f35511be78c1e5df9921
    Partial-Bug: #1651392
    Partial-Bug: #1651394
    Depends-On: Iaaede4ccb94c99d70f3ecad040d5ab6c41428c5e
    Depends-On: I577b3f36a12d14b4b5d546d9633d4629eb5d8a37