pkg/invoke: add unit test for env var ordering in Args.AsEnv
pkg/invoke: add unit test for env var ordering in Args.AsEnv

dcbw/cni,kad/cni,dcbw/cni,rosenhouse/cni,kad/cni,rosenhouse/cni,containernetworking/cni,containernetworking/cni,appc/cni,appc/cni