** Description changed:

- Since moving to docker 1.12, management of networks to be used by docker
- images is done via "docker network (create/rm)". Currently docker
- assumes (for the bridge driver at least) that it has to do full
- setup/cleanup of the associated bridge interface. This is fatal for
- those cases where an existing bridge interface is used to declare the
- network to docker.
+ [Impact]
+ Since moving to docker 1.12, management of networks to be used by docker 
images is done via "docker network (create/rm)". Currently docker assumes (for 
the bridge driver at least) that it has to do full setup/cleanup of the 
associated bridge interface. This is fatal for those cases where an existing 
bridge interface is used to declare the network to docker.
  
  This is fixed in docker 1.13 by the attached patch (this is a backport
  from docker upstream, it applies to yakkety and xenial but has to drop
  one more hunk in zesty).
+ 
+ [Test Case]
+ See https://wiki.ubuntu.com/DockerUpdates
+ 
+ [Regression potential]
+ See above.

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https://bugs.launchpad.net/bugs/1647376

Title:
  docker should not de-configure pre-existing bridge interfaces

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