enable shadow passwords

- fix login as admin
- fix startup parameter (disable root login)

package/dropbear/Makefile

@@ -26,7 +26,7 @@ CONFIGURE_STYLE=	gnu
 CONFIGURE_ARGS+=	--disable-pam \
 			--enable-openpty \
 			--enable-syslog \
-			--disable-shadow \
+			--enable-shadow \
 			--disable-lastlog \
 			--disable-utmp \
 			--disable-utmpx \

package/dropbear/files/dropbear.postinst

@@ -1,3 +1,3 @@
 #!/bin/sh
 . $IPKG_INSTROOT/etc/functions.sh
-add_rcconf '"NO" to disable' dropbear_flags ""
+add_rcconf '"NO" to disable' dropbear_flags "-w"