Add debug and options in Makefiles.

Reason: OBS' VM has some -Werror= options causing the compilation to fail.

WIP: Add a mechanism to replace the shebang of parse_link_errors.py when the main Makefile is called with $PYTHON_PATH defined.
Warning: this is a quick but dirty fix and it should be made more standard asap!

installation/metadata-collect-agent/Makefile: Re-enable the $PYTHON_PATH and $INCLUDE_PYTHON arguments.

[Buildout partially WORKS] installation/metadata-collect-agent/Makefile: Reorganize the Makefile to make it work with more standard parameters.

TEST: installation/metadata-collect-agent/Makefile: Test some solutions to a link-time bug in the buildout compilation.

TEST: installation/metadata-collect-agent/Makefile: Test some solutions to a link-time bug in the buildout compilation.

WIP: installation/metadata-collect-agent/Makefile: Add generic management for fmtlib and openssl includes paths, in order to support buildouts.

installation/metadata-collect-agent/Makefile: Pass the python includes path to the Makefile in a more generic way in buildouts.

WIP: Create an unsigned UEFI image. (The configuration file for signed image creation is kept for now as dracut.module/old.dracut.conf.