Adam J. Stewart 5af4d4f0ac Set default provider for every virtual package (#7784) ... * Set default provider for every virtual package * Add unit test to ensure that every virtual package has a default provider explicitly set		2018-05-05 17:26:47 -05:00
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spack	Set default provider for every virtual package (#7784)	2018-05-05 17:26:47 -05:00