net: linkwatch: allow vlans to get carrier changes faster

There is a time-lag of IFF_RUNNING flag consistency between vlan and
real devices when the real devices are in problem such as link or cable
broken.

This leads to a degradation of Availability such as a delay of failover
in HA systems using vlan since the detection of the problem at real
device is delayed.

We can avoid the linkwatch delay (~1 sec) for devices linked to another
ones, since delay is already done for the realdev.

Based on a previous patch from Mitsuo Hayasaka

Reported-by: Mitsuo Hayasaka <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Cc: Herbert Xu <[email protected]>
Cc: Patrick McHardy <[email protected]>
Cc: "Michał Mirosław" <[email protected]>
Cc: Tom Herbert <[email protected]>
Cc: Stephen Hemminger <[email protected]>
Cc: Jesse Gross <[email protected]>
Tested-by: Mitsuo Hayasaka <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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