message: move back to spack proper which has david's updates
diff: "package_version": "develop",
  "package_final_phase": "initconfig",
  "package_source_dir": "../..",
  -"spack_url": "https://github.com/davidbeckingsale/spack.git",
  -"spack_commit": "deb41f3f9c8fa24be44faf2729c4109cace3b4c8",
  +"spack_url": "https://github.com/spack/spack.git",
  +"spack_commit": "30f239478285d721b5b296a7715c65c2b8972f37",
  "spack_configs_path": "scripts/spack/configs",
  "spack_packages_path": "scripts/spack/packages",
  "spack_concretizer": "clingo",
  