Duplicate scripts in container

[hhorak]

In the Dockerfile, there are these three lines:

COPY ./contrib/ /opt/app-root
ADD contrib/bin/container-entrypoint /usr/bin/container-entrypoint
ADD contrib/bin/usage /usr/local/bin/usage

It means usage and container-entrypoint scripts will be twice in the container, both available in $PATH. It's probably unnecessary, using it on one place should be enough.

https://github.com/sclorg/devtoolset-container/blob/master/4-toolchain/Dockerfile.rhel7#L49