Kevin Wan f309e9f80c fix golint issues in core/utils (#520) %!s(int64=3) %!d(string=hai) anos
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keys.go 5e969cbef0 fix golint issues, else blocks (#457) %!s(int64=3) %!d(string=hai) anos
spancontext.go f309e9f80c fix golint issues in core/utils (#520) %!s(int64=3) %!d(string=hai) anos
trace.go f309e9f80c fix golint issues in core/utils (#520) %!s(int64=3) %!d(string=hai) anos