Handle netdev secondary addresses and labels

Fix the network-bridge logic to correctly transfer secondary IP address from $netdev to $bridge.

e.g. if you add an secondary address/label/alias with:

$> ip addr add 172.31.0.200/24 dev eth0 label eth0:00

then, "ip addr show dev eth0" gives e.g.:

inet 172.31.0.10/24 brd 172.31.0.255 scope global eth0 inet 172.31.0.200/24 scope global secondary eth0:00

and transfer_addrs() tries to execute:

ip addr add 172.31.0.10/24 brd 172.31.0.255 scope global dev tmpbridge ip addr add 172.31.0.200/24 scope global secondary dev tmpbridge:00

which causes the sript to fail because:

1) The device tmpbridge:00 doesn't exist
2) The "secondary" flag isn't valid

This patch fixes the sed commands to instead give:

ip addr add 172.31.0.10/24 brd 172.31.0.255 scope global dev tmpbridge label tmpbridge ip addr add 172.31.0.200/24 scope global dev tmpbridge label tmpbridge:00

diff -r 2491691e3e69 tools/examples/network-bridge
@@ -121,7 +121,8 @@ transfer_addrs () {
     ip addr show dev ${src} | egrep '^ *inet ' | sed -e "
 s/inet/ip addr add/
 s@\([0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+/[0-9]\+\)@\1@
-s/${src}/dev ${dst}/
+s/${src}/dev ${dst} label ${dst}/
+s/secondary//
 " | sh -e
     # Remove automatic routes on destination device
     ip route list | sed -ne "

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