Daniel Nephin 258019e01c 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: a9c86b63c03fc3557748d7792c11041387cb93d9
Component: engine
2017-03-14 16:00:43 -04:00
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