Todd Gamblin 3e94c4d573 env: move main Environment class and logic to spack.environment ...

- `spack.environment` is now the home for most of the infrastructure
   around Spack environments

- refactor `cmd/env.py` to use everything from spack.environment

- refactor the cmd/env test to use pytest and fixtures

2018-11-09 00:31:24 -08:00

..

spack

env: move main Environment class and logic to spack.environment

2018-11-09 00:31:24 -08:00