Compatibility issue with the docker-mendix-buildpack 5.x

[Christophe-Vico]

The docker-mendix-buildpack 5.0.x has been released to remove the use of the Ubuntu bionic image, and replace them by ubi8 / RHEL base image.

since we can't build the cf-mendix-buildpack anymore (see mendix/docker-mendix-buildpack#166).

The function _compose_mono_dependency_name is indeed containing a hard check of the type of distri, and will raise an error if the container is not based on Ubuntu.