Update gofmt for "cloudlogging" library.
Update gofmt for "cloudlogging" library.

Update gofmt for cloudlogging library. Also close channel to allow the
testing goroutine to terminate after the test.

BUG=
R=tandrii@chromium.org

Review URL: https://codereview.chromium.org/1266593004 .

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go