Initialize correctly the bridge interface

To initialize the bridge interface correctly we need to do the following:

   1) duplicate the IPs of INTERNET_IFACE to BRIDGE_IFACE
   2) duplicate routing table of INTERNET_IFACE to BRIDGE_IFACE
   3) delete routing table of INTERNET_IFACE

   NOTE: we don't need to delete the IPs of INTERNET_IFACE

We need the above because BRIDGE_IFACE is the master interface from now on
and it must know where is connected, otherwise connection is lost.

Fix #19