This fixes errors in ownership on directory creation during build that can cause inaccessible files depending on the paths in the Dockerfile and non-existing directories in the starting image. Add tests for the mkdir variants in pkg/idtools Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com> (github: estesp) Upstream-commit: ae8c004dc18c59fec9cd67759a5e0087300e872d Component: engine