php5: add php5-fpm module build (closes #789)

Signed-off-by: wuqiong <memccpy@gmail.com>

- split fpm config into main and pool file
- introduced uci config file
- re-worked init script

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

lang/php5/files/php5-fpm.init

@@ -0,0 +1,29 @@
+#!/bin/sh /etc/rc.common
+# Copyright (C) 2015 OpenWrt.org
+
+START=50
+
+PROG=/usr/bin/php-fpm
+CONFIG=/etc/php5-fpm.conf
+
+SERVICE_PID_FILE=/var/run/php5-fpm.pid
+
+start_instance() {
+	local section="$1"
+	local enabled
+
+	config_get_bool enabled "$section" 'enabled' 0
+
+	[ $enabled -gt 0 ] || return 1
+
+	service_start $PROG -y $CONFIG -g $SERVICE_PID_FILE
+}
+
+start() {
+	config_load 'php5-fpm'
+	config_foreach start_instance 'php5-fpm'
+}
+
+stop() {
+	service_stop $PROG
+}