packaging: bump minimal Go version to 1.8
packaging: bump minimal Go version to 1.8

lebauce/skydive,lebauce/skydive,skydive-project/skydive,lebauce/skydive,lebauce/skydive,skydive-project/skydive,safchain/skydive,safchain/skydive,skydive-project/skydive,safchain/skydive,lebauce/skydive,safchain/skydive,skydive-project/skydive,skydive-project/skydive,safchain/skydive,skydive-project/skydive,safchain/skydive,skydive-project/skydive,lebauce/skydive,lebauce/skydive,safchain/skydive,lebauce/skydive,safchain/skydive