Alessandro Boch ba221c0328 Properly identify ingress network created with older swarm
- otherwise docker network prune will remove it

Signed-off-by: Alessandro Boch <aboch@docker.com>
Upstream-commit: 93763f11eeec5e9b1d0308a3ad85bbf069f9107f
Component: engine
2017-05-18 19:47:45 -07:00
Description
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