deployment.sh: always set internal network in pro systems, even when using dhcp

From: Michael Prokop <mprokop@sipwise.com>

deployment.sh

@@ -961,6 +961,19 @@ iface lo inet loopback
 allow-hotplug $EXTERNAL_DEV
 iface $EXTERNAL_DEV inet dhcp
 EOF
+  # make sure internal network is available even with external
+  # device using DHCP
+  if "$PRO_EDITION" ; then
+  cat >> $TARGET/etc/network/interfaces << EOF
+
+auto $INTERNAL_DEV
+iface $INTERNAL_DEV inet static
+        address $INTERNAL_IP
+        netmask $INTERNAL_NETMASK
+        dns-nameservers $(awk '/^nameserver/ {print $2}' /etc/resolv.conf | xargs echo -n)
+
+EOF
+  fi
 else
   # assume host system has a valid configuration
   if "$PRO_EDITION" && "$BONDING" ; then