Define dockerfile instructions set centrally. #103
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[Fixes-74](https://github.com/docker-slim/docker-slim/issues74
What
Centrally defines all supported Docker instructions (and their prefixed forms) inside
/pkg/docker/dockerfile/dockerfile.go
; replace usage of currently re-defined consts from/pkg/docker/linter/
,/pkg/docker/dockerfile/
,/pkg/docker/instruction/instruction.go
,/pkg/imagebuilder/imagebuilder.go
Why
How Tested
two unittests added to verify that the upper-/lower-case writing is now correctly covered; at the end via
make test
.