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Yong Tang f99fd5a3f9 Idempotent service update --publish-add

This fix tries to address the issue raised in 25375 where
`service update --publish-add` returns an error if the exact
same value is repeated (idempotent).

This fix use a map to filter out repeated port configs so
that `--publish-add` does not error out.

An integration test has been added.

This fix fixes 25375.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
(cherry picked from commit b487497cd2d7586fd7e10affdcc514ca6b7884f6)
Signed-off-by: Tibor Vass <tibor@docker.com>

2016-08-11 17:56:51 -07:00