specs: add convenience function for reading spec dependencies from node dict
specs: add convenience function for reading spec dependencies from node dict

iulian787/spack,LLNL/spack,LLNL/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,iulian787/spack