Take net lock before kernel lock.

Doing KERNEL_LOCK() just before NET_LOCK() does not make sense.
Net lock is a rwlock that releases kernel lock during sleep.  To
avoid an unnecessary release and take kernel lock cycle, move
KERNEL_LOCK() after NET_LOCK().
There is no lock order reversal deadlock issue.  Both locks are
used in any order thoughout the kernel.  As NET_LOCK() releases the
kernel lock when it cannot take the lock immediately and has to
sleep, we always end in the order kernel lock before net lock after
sleeping.

OK sashan@

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