[lxc] default to target runlevel 3

builder/lxc/config.go

@@ -50,6 +50,10 @@ func NewConfig(raws ...interface{}) (*Config, error) {
 		c.ContainerName = fmt.Sprintf("packer-%s", c.PackerBuildName)
 	}
 
+	if c.TargetRunlevel == 0 {
+		c.TargetRunlevel = 3
+	}
+
 	if c.CommandWrapper == "" {
 		c.CommandWrapper = "{{.Command}}"
 	}

builder/lxc/step_wait_init.go

@@ -93,7 +93,7 @@ func (s *StepWaitInit) waitForInit(state multistep.StateBag, cancel <-chan struc
 			log.Printf("Container finished init.")
 			break
 		} else if currentRunlevel > targetRunlevel {
-			log.Printf("Expected Runlevel %d, Got Runlevel %s, continuing", targetRunlevel, currentRunlevel)
+			log.Printf("Expected Runlevel %s, Got Runlevel %s, continuing", targetRunlevel, currentRunlevel)
 			break
 		}