allow basic logging for http Get err with RegisterErrLogFn#81

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qbig wants to merge 3 commits intogolang:masterfrom

Commits on Apr 12, 2017

allow basic logging for http Get err with RegisterErrLogFn
Qiao Liang
committed

Commits on May 4, 2017

allow basic logging for http Get err with RegisterErrLogFn, include context info (ctx, peer, key, err)
Qiao Liang
committed
Merge branch 'master' of https://github.com/qbig/groupcache
Qiao Liang
committed