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Switching from a single i3-8100 machine to 3 Xeon E-2288G machines.

Also drop driver and OS versions for Linux GTX 1660 bot
to simplify upgrades.

TBR=kbr

Bug: 1042292
Change-Id: I9630d921ae8044ba5ad60e78b8f298a8369d365b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419127
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808577}