Doug Davis 0a3eeb1d23 Generate an error on unknown Dockerfile instruction
Instead of just printing a warning and going on, this will generate
an error and stop processing.

This used to be part of #10561 but I decided it might need its own
independent discussion/PR as to not derail #10561.

Signed-off-by: Doug Davis <dug@us.ibm.com>
Upstream-commit: 8a5b50d65dae2d0607e046c57241dd6b46b65c6a
Component: engine
2015-03-13 16:08:34 -07:00
Description
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