Fix for minimal image build from submodule

Konrad Botorrequested to merge
kbotor/build-from-submodule-fix into develop

If the minimal image is built from haf checked out as a submodule, it'll fail to start with error /home/haf_admin/docker_entrypoint.sh: line 22: /home/haf_admin/source/haf/scripts/copy_datadir.sh: No such file or directory

This is a fix for that issue.

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