deployment: set dns + gateway config on DEFAULT_INSTALL_DEV

From: Michael Prokop <mprokop@sipwise.com>

deployment.sh

@@ -1199,12 +1199,12 @@ if "$PRO_EDITION" ; then
     ngcp-network --host=$ROLE --set-interface=$DEFAULT_INSTALL_DEV --ip=auto --netmask=auto --hwaddr=auto
     ngcp-network --host=$ROLE --set-interface=$INTERNAL_DEV --ip=auto --netmask=auto --hwaddr=auto
     for nameserver in $(awk '/^nameserver/ {print $2}' /etc/resolv.conf) ; do
-      ngcp-network --host=$ROLE --set-interface=$INTERNAL_DEV --dns=\$nameserver
+      ngcp-network --host=$ROLE --set-interface=$DEFAULT_INSTALL_DEV --dns=\$nameserver
     done
 
-    GW=$(ip route show dev $INTERNAL_DEV | awk '/^default via/ {print $3}')
+    GW=$(ip route show dev $DEFAULT_INSTALL_DEV | awk '/^default via/ {print $3}')
     if [ -n "\$GW" ] ; then
-      ngcp-network --host=$ROLE --set-interface=$INTERNAL_DEV --gateway="\$GW"
+      ngcp-network --host=$ROLE --set-interface=$DEFAULT_INSTALL_DEV --gateway="\$GW"
     fi
 
     ngcp-network --host=$ROLE --peer=$PEER