[bugfix] fixes the requirement.txt to use correct package names.
fixes the requirements.txt file package names - A bug was in there. It creeps me how that went through. @perarnau @fmonna the argopkgs version was also just reverted to py27, so using the latest master there will work for packaging. I guess I need to follow a stricter process for the synchronization between nrm and argopkgs merges.