cabal-install: Fix PackageTests using user's config
- previously, tests did not specify config file; default one in ~/.cabal/ was used. test result depended on non-repository content. - now, PackageTester has extra parameter for config-file to use. - the default procedure now is to generate a default config file in "PackageTests/cabal-config" and use that. - specific tests also are able to use non-default config.
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