Daniel Nephin b84c939d61 Extract two functions from the FROM dispatcher
This helps clarify the difference cases for parsing ctxName, and for
getting an image.

Signed-off-by: Daniel Nephin <dnephin@docker.com>
Upstream-commit: 4d62f67117ca515671fcc882807bfc4862067ea6
Component: engine
2017-04-13 14:56:57 -04:00
S
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