udhcp: change UDHCP_DEBUG into int, make verbosity selectable with -v

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/udhcp/script.c b/networking/udhcp/script.c
index 97c1d30..22780d8 100644
--- a/networking/udhcp/script.c
+++ b/networking/udhcp/script.c
@@ -218,7 +218,7 @@
 	if (client_config.script == NULL)
 		return;
 
-	DEBUG("vfork'ing and exec'ing %s", client_config.script);
+	log1("Executing %s", client_config.script);
 
 	envp = fill_envp(packet);