oh yeah actually include the ConcatFlags function

cmd/bytemark/cliutil/concat_flags.go

@@ -0,0 +1,21 @@
+package cliutil
+
+import (
+	"github.com/urfave/cli"
+)
+
+// ConcatFlags combines multiple slices of flags together without modification
+func ConcatFlags(flagSets ...[]cli.Flag) (res []cli.Flag) {
+	// saves us re-allocating each time.. Probably doesn't save a lot of
+	// memory/GC time in real life but eh. Feels good to be efficient.
+	totalLen := 0
+	for i := range flagSets {
+		totalLen += len(flagSets[i])
+	}
+	res = make([]cli.Flag, 0, totalLen)
+
+	for i := range flagSets {
+		res = append(res, flagSets[i]...)
+	}
+	return
+}