Previously, when updating a router all its interfaces where removed and
readded by Ansible's os_router module. As a unwanted side effect all
active connections of the router and nat'ed devices where dropped,
closing e.g. all active tcp sessions. Now, only necessary changes
are applied.
Task: 40136
Story: 2007845
Change-Id: I172caf360e6e342dd54865da5a5b72b0dc0205c8
This is separate from the previous patch - it's just the results
of running the script so we can review the two a little independently.
We should probably squash them.
Change-Id: I838f15cf4a32455a5be20033c8ddc27db6ca15c0
