Greg Becker 1808ba3c68 install: add --cache-only option (#12729) ...

* add `--cache-only` option to install
* testing for `--cache-only`
* remove extraneous stage creation at stage destroy time

2019-10-12 11:43:37 -07:00

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spack

install: add --cache-only option (#12729)

2019-10-12 11:43:37 -07:00