Peter Scheibel 24775697f5 Mirrors: add option to exclude packages from "mirror create" (#14154) ... * add an --exclude-file option to 'spack mirror create' which allows a user to specify a file of specs to exclude when creating a mirror. this is anticipated to be useful especially when using the '--all' option * allow specifying number of versions when mirroring all packages * when mirroring all specs within an environment, include dependencies of root specs * add '--exclude-specs' option to allow user to specify that specs should be excluded on the command line * add test for excluding specs		2020-06-03 17:43:51 -07:00
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spack	Mirrors: add option to exclude packages from "mirror create" (#14154)	2020-06-03 17:43:51 -07:00