hs20: prepare server using uci-defaults and ship files

Setup user database if non-existent, configure uhttpd .php interpreter
and patch php scripts to work out-of-the-box.
Also ship Hotspot 2.0 SPP and OMA DM XML schema/DTD files needed at
run-time for both client and server.

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

net/hs20/files/hs20-server.defaults

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+uci -q get uhttpd.main.interpreter | grep -q "^\.php" || uci -q batch <<-EOF >/dev/null
+add_list uhttpd.main.interpreter='.php=/usr/bin/php-cgi'
+commit uhttpd
+EOF
+
+mkdir -p /etc/hs20/AS/DB
+[ -e /etc/hs20/AS/DB/eap_user.db ] || sqlite3 /etc/hs20/AS/DB/eap_user.db < /usr/share/hs20/sql.txt
+
+exit 0