Deployment fails with "bridge #{br_name} can not be included into more then one element"

[Josias Montag]

Steps to reproduce:
1) Create new environment
2) Add some machines
3) Create a custom network template which contains a bridge, which is connected to >2 other bridges. (Example attached)
5) Upload the network template
6) Deploy

Deployment fails with:

bridge br-vrack can not be included into more then one element, elements: [{"action"=>"add-patch", "bridges"=>["br-vrack", "br-fw-admin"], "mtu"=>65000, "provider"=>"ovs"}, {"action"=>"add-patch", "bridges"=>["br-floating", "br-vrack"], "mtu"=>65000, "provider"=>"ovs"}, {"action"=>"add-patch", "bridges"=>["br-prv", "br-vrack"], "mtu"=>65000, "provider"=>"ovs"}] at /etc/puppet/modules/openstack_tasks/manifests/openstack_network/server_config.pp:134

This bug seems to be introduced by Change-Id:
Idfa4cbd5672a21d651be349b9b3602b0498173e5 (https://review.openstack.org/#/c/320942/)

The same network template worked fine with an older Fuel 9.0 build without the mentioned change.

[Dmitry Klenov (dklenov)]

Network team, please verify, if it is intended behaviour.