docker: use common.NormalizeValue() to set "Labels"
docker: use common.NormalizeValue() to set "Labels"

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