net/nut: Protect CGI via HTTP Basic Auth

When using uhttpd (the default), protect NUT CGI
via HTTP Basic Auth.

Signed-off-by: Daniel Dickinson <lede@cshore.thecshore.com>

net/nut/Makefile

@@ -275,6 +275,7 @@ define Package/nut-web-cgi/conffiles
 /etc/nut/upsstats.html
 /etc/nut/upsstats-single.html
 /etc/config/nut_cgi
+/etc/httpd.conf
 endef
 
 define Package/nut-web-cgi/install

net/nut/files/add_nut_httpd_conf

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+grep -q '/cgi-bin/nut' /etc/httpd.conf 2>/dev/null || {
+	echo '/cgi-bin/nut:root:$p$root' >>/etc/httpd.conf
+	/etc/init.d/uhttpd restart
+}