Yong Tang 7e1b46c8ff Remove deprecated Docker Content Trust ENV passphrase variables
Since 1.9, Docker Content Trust Offline key has been renamed to
Root key and the Tagging key has been renamed to Repository key.
The corresponding environment variables
`DOCKER_CONTENT_TRUST_OFFLINE_PASSPHRASE`
`DOCKER_CONTENT_TRUST_TAGGING_PASSPHRASE`
have also been deprecated and renamed to
`DOCKER_CONTENT_TRUST_ROOT_PASSPHRASE`
`DOCKER_CONTENT_TRUST_REPOSITORY_PASSPHRASE`

This fix removed the deprecated ENV passphrase variables for
1.12 and updated the docs.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Upstream-commit: e1242ed726
Component: cli
2017-06-02 00:07:37 +00:00
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