snowflake: add package

Package Tor's Snowflake system components so users can offer e.g.
a standalone Snowflake proxy on their routers or other devices.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

net/snowflake/files/snowflake-proxy.init

@@ -0,0 +1,18 @@
+#!/bin/sh /etc/rc.common
+
+START=99
+
+USE_PROCD=1
+NAME=snowflake-proxy
+PROG=/usr/bin/$NAME
+
+start_service() {
+	procd_open_instance
+	procd_set_param command "$PROG" -verbose
+	procd_set_param stdout 1
+	procd_set_param stderr 1
+	procd_set_param user snowflake
+	procd_set_param group snowflake
+	procd_set_param respawn
+	procd_close_instance
+}