[detach-service] Firewall manifests are not apply-able for 7.0

[Vladimir Khlyunev]

Found on 7.0 release iso:

1) Build any(or all) detach-plugins and install it
2) Create cluster with any configuration, enable plugins, add 1 controller, 1 role from plugins, 1 compute
3) Deploy changes

Result: deployment failed with:
Unknown function get_routable_networks_for_network_role at /etc/fuel/plugins/detach-database-1.1/database_firewall.pp:16 on node node-2.test.domain.local

Root cause is that plugins were modified according to changes from 8.0. We should create stable branch for all plugins repos and rollback changes in it.

[Vladimir Khlyunev (vkhlyunev)]

Looks like stable branches was created but the bug wasn't updated:
https://github.com/openstack/fuel-plugin-detach-database/tree/stable/7.0
https://github.com/openstack/fuel-plugin-detach-keystone/tree/stable/7.0
https://github.com/openstack/fuel-plugin-detach-rabbitmq/tree/stable/7.0