Daniel Nephin 63bca6acc7 Fix environment resolving.
Load from env should only happen if the value is unset.
Extract a buildEnvironment function and revert some changes to tests.

Signed-off-by: Daniel Nephin <dnephin@docker.com>
Upstream-commit: 146d3eb304
Component: cli
2017-03-14 16:00:43 -04:00
2017-03-14 16:00:43 -04:00
S
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