added sql/rw-psk-ipv4 scenario

testing/tests/sql/rw-psk-ipv4/hosts/dave/etc/strongswan.conf

@@ -0,0 +1,9 @@
+# /etc/strongswan.conf - strongSwan configuration file
+
+charon {
+  plugins {
+    sql {
+      database = sqlite:///etc/ipsec.d/ipsec.db 
+    }
+  }
+}