WIP for now Revert "Use spack develop branch again"

This reverts commit 56976f1.

Author: tdrwenski

.uberenv_config.json

@@ -3,8 +3,8 @@
 "package_version" : "develop",
 "package_final_phase" : "initconfig",
 "package_source_dir" : "../..",
-"spack_url": "https://github.com/spack/spack.git",
-"spack_branch": "develop",
+"spack_url": "https://github.com/tdrwenski/spack.git",
+"spack_branch": "test-cached-cmake-mpi",
 "spack_activate" : {},
 "spack_configs_path": ".ci-scripts/radiuss-spack-configs",
 "spack_packages_path": [".ci-scripts/radiuss-spack-configs/packages"],