Fix up system test for Go 1.8
Fix up system test for Go 1.8

neolynx/aptly,smira/aptly,neolynx/aptly,adfinis-forks/aptly,smira/aptly,neolynx/aptly,aptly-dev/aptly,aptly-dev/aptly,smira/aptly,aptly-dev/aptly,adfinis-forks/aptly,adfinis-forks/aptly