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4d35864c3d
It's possible to remove a legacy link from running containers.
When that happens, the Sandbox's Endpoints are removed and
re-added.
Since commit 65120d5 ("Create bridge veth in container netns")
the veth device has been created in the container's netns. When
that happens, a flag is set on the Endpoint to note that it
does not need to be moved into the netns.
But, during the Leave/Join (Sandbox.Refresh) the veth is moved
out of the netns. So, clear the flag during the Leave, to note
that it needs to be moved back in during the Join.
Signed-off-by: Rob Murray <rob.murray@docker.com>