New PHP management

- New versions (7.x)
- PHP upstream name
- Sites can use : default PHP version, select first one by PHP version,
  select by upstream name
- Add PHP filter plugin

filter_plugins/php.py

@@ -0,0 +1,25 @@
+def php_default_upstream_socket(php_version):
+    if php_version == '5.6':
+        return '/run/php5-fpm.sock'
+    else:
+        return '/run/php/php%s-fpm.sock' % php_version
+
+def php_default_upstream_name(php_version):
+    return 'default_php_%s' % php_version
+
+def php_fpm_service(php_version):
+    if php_version == '5.6':
+        return 'php5-fpm'
+    else:
+        return 'php%s-fpm' % php_version
+
+class FilterModule(object):
+    ''' PHP module '''
+
+    def filters(self):
+        return {
+            'php_default_upstream_socket': php_default_upstream_socket,
+            'php_default_upstream_name': php_default_upstream_name,
+            'php_fpm_service': php_fpm_service,
+            'php_fpm_package': php_fpm_service
+        }