No external router results in heat stack failure

[Steve McLellan]

If a user doesn't have an external router configured, murano inserts NOT_FOUND as the router_id.

Firstly, if it can't find a good one to use, it should fail out. Currently, heat rejects the template and rolls back.

Second, choosing the first available router could cause its own issues.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/119800

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/119800
Committed: https://git.openstack.org/cgit/stackforge/murano/commit/?id=f1905be3367e8ed767794f2e54b55b15918628ff
Submitter: Jenkins
Branch: master

commit f1905be3367e8ed767794f2e54b55b15918628ff
Author: Serg Melikyan <email address hidden>
Date: Mon Sep 8 20:02:05 2014 +0400

    Use only specific router for created networks

    Murano should not use first available router it may create
    different networking issues cause router may not have access to
    external network.

    Closes-bug: #1366124
    Change-Id: I223a4862c3b20cfb20281be6bd9376be3644ad92

[Ryan Peters (rjpeter2)]

Also related: https://review.openstack.org/#/c/121679/