docker network prune
`docker network prune` prunes unused networks, including overlay ones. `docker system prune` also prunes unused networks. Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp> Upstream-commit: d5d520f0d7 Component: cli
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Signed-off-by: allencloud <allen.sun@daocloud.io> Upstream-commit: 871b692833 Component: cli
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Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com> Upstream-commit: 6f8bb41ecb Component: cli
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