br-ex isn't getting programmed with Table-Miss (OF_NORMAL) flow entry when using 1.3 Provider

The OVSDB Plugin programs the br-int and br-ex bridges with the appropriate flows as they are discovered by the plugin. The OpenFlow 1.0 provider correctly installs the LLDP and NORMAL flows, but the OpenFlow 1.3 provider does not install the NORMAL flow on the br-ex bridge (note: the NORMAL flows are only installed on br-ex bridges, and not br-int bridges, when using OpenFlow 1.3). The fix is to add programming of the NORMAL flow on br-ex bridges when using the OpenFlow 1.3 provider.