[patch] reducing arp locking

[Alexander V. Chernikov]

Hello list!

Currently we need to acquire 2 read locks to perform simple 6-byte 
copying from arp record to packet ethernet header.

It seems that acquiring lle lock for fast path (main traffic flow) is 
not necessary even with current code.

My tests shows ~10% improvement with this patch applied.

If nobody objects I plan to commit this change at the end of next week.

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