provide attributes from SQL database

testing/hosts/default/etc/ipsec.d/tables.sql

@@ -183,6 +183,13 @@ CREATE TABLE leases (
   released INTEGER NOT NULL
 );
 
+DROP TABLE IF EXISTS attributes;
+CREATE TABLE attributes (
+  id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+  type INTEGER NOT NULL,
+  value BLOB NOT NULL
+);
+
 DROP TABLE IF EXISTS ike_sas;
 CREATE TABLE ike_sas (
   local_spi BLOB NOT NULL PRIMARY KEY,