Remove -Werror

-Werror just doesn't work because it changes too much
between compiler versions.
ip link: fix display of interface groups

This change adds the interface group to the output of "ip link show".

It also makes "ip link" print _all_ devices if no group filter is specified;
previously, only interfaces of the default group (0) were shown.

Signed-off-by: Stefan Tomanek <stefan.tomanek@wertarbyte.de>
iproute vxlan add support for fdb replace command

Add support for the bridge fdb replace command to replace an
existing entry in the vxlan device driver forwarding data base.
The entry is identified with its unicast mac address and its
corresponding remote destination information is updated.

This is useful for virtual machine migration and replaces the
bridge fdb del and bridge fdb add commands.

It follows the same interface as ip neigh replace commands.

Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
cleanup help message

Split it naturally
Fix spelling errors

Minor errors found by codespell
More minor spelling fixes