[Backport 1465434] DVR issues with supporting multiple subnets per network on DVR routers

[Eugene Nikanorov]

Need to backport upstream fix for 1465434

As a result of the bug, external connectivity for the subnet could be lost.

[Bug Checker Bot (bug-checker)]

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[Eugene Nikanorov (enikanorov)]

Invalid for 8.0+

[Fuel Devops McRobotson (fuel-devops-robot)]

Fix proposed to branch: openstack-ci/fuel-7.0/2015.1.0
Change author: Swaminathan Vasudevan <email address hidden>
Review: https://review.fuel-infra.org/21963

[Eugene Nikanorov (enikanorov)]

It appeared that this fix can't be backported to Kilo as is, as it depends on Liberty stuff.
Given that severity of the bug is not too high, we may consider the bug to be won't fix

[Fuel Devops McRobotson (fuel-devops-robot)]

Change abandoned by Eugene Nikanorov <email address hidden> on branch: openstack-ci/fuel-7.0/2015.1.0
Review: https://review.fuel-infra.org/21963