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