Dennis Chen 4c5e76b26e Fix the target name issue for multi-stage build
This PR is trying to fix issue #36956.

The stage name is case-insensitive by design, so we should use
`strings.EqualFold()` as the comparison method to eliminate the
case sensitive noise.

Also we need to return a pre-defined error code order to avoid below
message like:
"FIXME: Got an API for which error does not match any expected type!!!:
failed to reach build target dev in Dockerfile"

Signed-off-by: Dennis Chen <dennis.chen@arm.com>
Upstream-commit: 7c0570473cfa181aeb3278072cc9af4f9298cb98
Component: engine
2018-05-01 10:28:40 +08:00
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