cmd/mbf: optional init verbosity

This output is generally not needed and only useful when debugging container machinery itself.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/mbf/main.go

@@ -108,6 +108,10 @@ func main() {
 		&flagCheck,
 		"check", command.BoolFlag(true),
 		"Run test suites",
+	).Flag(
+		&cm.verboseInit,
+		"v", command.BoolFlag(false),
+		"Do not suppress verbose output from init",
 	).Flag(
 		&cm.cures,
 		"cures", command.IntFlag(0),
@@ -710,6 +714,7 @@ func main() {
 				z.Hostname = "localhost"
 				z.Uid, z.Gid = (1<<10)-1, (1<<10)-1
 				z.Stdin, z.Stdout, z.Stderr = os.Stdin, os.Stdout, os.Stderr
+				z.Quiet = !cm.verboseInit
 				if s, ok := os.LookupEnv("TERM"); ok {
 					z.Env = append(z.Env, "TERM="+s)
 				}