Lucid SRU: UBUNTU: SAUCE: igb: Protect stats update

[Tim Gardner]

This patch is a partial backport of upstream 
12dcd86b75d571772512676ab301279952efc0b0. Its purpose is twofold; 1) 
Protect simultaneous readers and writers, 2) refresh statistics when 
read from ethtool.

rtg
-- 
Tim Gardner tim.gardner at canonical.com
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