[swarming] Remove sys.version_info for python2 support

client/utils/large.py still needs Python2 support since it's used by server.
https://source.chromium.org/search?q=f:swarming%20(large.unpack%20OR%20large.pack)&sq=

Bug: 1247959
Change-Id: I9964635444d008960f4f00469f4d3980d4e978c9
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/3386748
Auto-Submit: Junji Watanabe <jwata@google.com>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
NOKEYCHECK=True
GitOrigin-RevId: d3f990db2d0af033542c89d8bc1fc6a5cedf773d
2 files changed
tree: 9a7e0717a7a17b1a850c0d2da859ba1c6ff30f95
  1. tests/
  2. __init__.py
  3. bootstrap.py
  4. OWNERS
  5. stream.py
  6. streamname.py
  7. varint.py