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Fix command line tests again: config test was clobbering os.environ to point `SG_CONFIG_FILE` to `/.sgconfig` and not changing it back. This was fine when command line tests that run `create_config_dict` (which loads the config from scratch) ran before config tests (`test_commandline.py` comes before `test_config.py`) and all other tests used the preinitialized `CONFIG` dict but now tests in `commandline` directory come after `test_config.py` and so this breaks.

Fixed by adding a context manager that patches out os.environ and using that to patch `SG_CONFIG_FILE` instead (this is done in some other places already).

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