[logdog] Start using 4 new pull queues.
[logdog] Start using 4 new pull queues.

R=1dcb292530f82960316cb3d87cd67c3f212b79cb@chromium.org, iannucci@chromium.org

Change-Id: I3c18271f54452feb167211afca13c3f04fc194fd
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/3598018
Reviewed-by: Scott Lee <1dcb292530f82960316cb3d87cd67c3f212b79cb@chromium.org>
Commit-Queue: Vadim Shtayura <9f116ddb1b24f6fc1916a676eb17161b6c07dfc1@chromium.org>

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