kolla do not support the custom base image

[Jeffrey Zhang]

we are using the base_distro for condition test in the Dockerfile.j2. When
using a custom base image, it will be failure.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/313295

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/313295
Committed: https://git.openstack.org/cgit/openstack/kolla/commit/?id=070bf258357c85a7b4411dc97f75df7d19e9792c
Submitter: Jenkins
Branch: master

commit 070bf258357c85a7b4411dc97f75df7d19e9792c
Author: Jeffrey Zhang <[e-mail]>
Date: Fri May 6 17:30:47 2016 +0800

    Support a custom base image

    Add a new option(base-image) to support custom base image
    In default, the base-image is equal to base. When using custom
    image, please use command line like:

        ./tool/build.py --base-image my-image --base centos --base-tag 0.1

    DocImpact

    Closes-Bug: #1573544
    Change-Id: If4b9c57a2b68f6f06d3e981f30b2173064e02193

[Doug Hellmann (doug-hellmann)]

This issue was fixed in the openstack/kolla 3.0.0.0b1 development milestone.