IPVS: convert __ip_vs_sched_lock to a spinlock

Also rename __ip_vs_sched_lock to ip_vs_sched_lock.

Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>