Yong Tang d918c4ba81 Add --filter scope=swarm|local for docker network ls
This fix tries to address the request in 31324 by adding
`--filter scope=swarm|local` for `docker network ls`.

As `docker network ls` has a `SCOPE` column by default,
it is natural to add the support of `--filter scope=swarm|local`.

This fix adds the `scope=swarm|local` support for
`docker network ls --filter`.

Related docs has been updated.

Additional unit test cases have been added.

This fix fixes 31324.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Upstream-commit: 704ea8f6b4ad6f43c348affe357994d440aaf3de
Component: engine
2017-03-23 18:48:11 -07:00
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