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This fix tries to address the issue in 25404 where updating environmental variable in `service update --env-add` will not work. The issue is because `--env-add` will only append the env, not update if the same env already exist. This fix tracks the env variable with a map and update if the variable is the same. An integration test has been added. This fix fixes 25404. Signed-off-by: Yong Tang <yong.tang.github@outlook.com> (cherry picked from commit c6de8add5fd5443aa820adbcd3c9a438df78823f) Signed-off-by: Tibor Vass <tibor@docker.com>