Refactor the way urls are listed.
Refactor the way urls are listed.

The old API will be refactored to have clearer /swarming/api/v1/ prefixes in the
new API. This CL makes it clearer which handlers belongs to which uses case,
which will make incremental transition (clients, then bots, then frontend or
another order) easier.

R=csharp@chromium.org
BUG=swarming:82

Review URL: https://codereview.appspot.com/100760043

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