Peter Scheibel 0b99cc2261 Environments/views: only override spec prefix for non-external packages (#15475) ... * only override spec prefix for non-external packages * add test that environment shell modifications respect explicitly-specified prefixes for external packages * add clarifying comment		2020-04-03 13:26:33 -07:00
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spack	Environments/views: only override spec prefix for non-external packages (#15475)	2020-04-03 13:26:33 -07:00