Daniel Nephin 8c6400b4e4 Refactor BuildArgs
Add MetaArgs for ARG that occur before the first FROM
Integration test for these cases.

Signed-off-by: Daniel Nephin <dnephin@docker.com>
Upstream-commit: 239c53bf836174108dbae445a394a290f5fe2898
Component: engine
2017-04-07 17:57:47 -04:00
2017-04-07 17:57:47 -04:00
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