Format swarming/test_api.py
Format swarming/test_api.py

Change-Id: I1259f6a38587656e14306a72c2f7d05dfa2c3d69
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/recipes-py/+/2366496
Auto-Submit: Ye Kuang <1cd89f22f3967fc3dcb883b53940be4b98ec483f@google.com>
Commit-Queue: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Reviewed-by: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>

luci/recipes-py,luci/recipes-py