Incorporate oslo config migration in Kolla-ansible

Registered by Nguyen Hung Phuong

Two of the most important and challenging requirements in OpenStack upgrading are database migration and configuration migration. Database migration has been done by service itself and already implemented in Kolla but nothing for configuration migration.

Configuration migration is implemented partially in Oslo [1] and we should apply it in Kolla.

[1] https://review.openstack.org/#/c/520043/

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Drafter:
Nguyen Hung Phuong
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