Comment 3 for bug 1709066

Reviewed: https://review.openstack.org/491463
Committed: https://git.openstack.org/cgit/openstack/tripleo-quickstart-extras/commit/?id=5178fafc0bc67c21d4d7dde51dbe51bf79390d8c
Submitter: Jenkins
Branch: master

commit 5178fafc0bc67c21d4d7dde51dbe51bf79390d8c
Author: Jiri Stransky <email address hidden>
Date: Mon Aug 7 13:48:42 2017 +0200

    Make container varaibles defined for upgrades

    The upgrade job was failing with:

        AnsibleUndefinedVariable: 'docker_registry_namespace' is undefined

    The docker variables aren't only used by the overcloud-prep-containers
    role, they're also used during upgrade. This change moves the defaults
    to extras-common role so that they're available during the upgrade
    too.

    The ctl_plane_ip variable is renamed to local_docker_registry_host to
    better capture its purpose in its name.

    Also, add the insecure registry param, which was left out when moving
    to the `container image prepare` command.

    Change-Id: Ifa2afa915e0fee368fb2506c02de75bf5efe82d5
    Closes-Bug: #1709066