Fix compression test for Go 1.7+
Fix compression test for Go 1.7+

smira/aptly,jola5/aptly,adfinis-forks/aptly,neolynx/aptly,aptly-dev/aptly,jola5/aptly,smira/aptly,smira/aptly,aptly-dev/aptly,aptly-dev/aptly,adfinis-forks/aptly,adfinis-forks/aptly,jola5/aptly,neolynx/aptly,neolynx/aptly