Sort swarming/index.yaml.
Sort swarming/index.yaml.

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R=csharp@chromium.org
BUG=

Review URL: https://codereview.appspot.com/80430044

madecoste/swarming,madecoste/swarming,madecoste/swarming,luci/luci-py,luci/luci-py,madecoste/swarming,pombreda/swarming,pombreda/swarming,luci/luci-py,pombreda/swarming,pombreda/swarming,luci/luci-py