revert back to multiconfig

common/cmdarg/cmdarg.go

@@ -0,0 +1,16 @@
+package cmdarg
+
+import "strings"
+
+// Arg is used by flag to accept multiple argument.
+type Arg []string
+
+func (c *Arg) String() string {
+	return strings.Join([]string(*c), " ")
+}
+
+// Set is the method flag package calls
+func (c *Arg) Set(value string) error {
+	*c = append(*c, value)
+	return nil
+}