Use configuration on determine test path
Use configuration on determine test path

Fix https://bugs.swift.org/browse/SR-1159

apple/swift-package-manager,vmanot/swift-package-manager,vmanot/swift-package-manager,mxcl/swift-package-manager,apple/swift-package-manager,vmanot/swift-package-manager,JGiola/swift-package-manager,JGiola/swift-package-manager,JGiola/swift-package-manager,mxcl/swift-package-manager,abertelrud/swift-package-manager,sschiau/swift-package-manager,JGiola/swift-package-manager,vmanot/swift-package-manager,sschiau/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,mxcl/swift-package-manager,vmanot/swift-package-manager,sschiau/swift-package-manager,haskellswift/swift-package-manager,haskellswift/swift-package-manager,JGiola/swift-package-manager,apple/swift-package-manager,sschiau/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,sschiau/swift-package-manager,apple/swift-package-manager,haskellswift/swift-package-manager,haskellswift/swift-package-manager,mxcl/swift-package-manager