Revert "[infra] Enable QuadroP400 bots on rack:2"

This reverts commit 297caafc5805723d445f603b71c70a9e144113ee.

Reason for revert: I think I have identified a test that shows the perf differences: https://perf.skia.org/e/?begin=1537548564&end=1537984657&keys=5743052312281088

Original change's description:
> [infra] Enable QuadroP400 bots on rack:2
> 
> I tried to determine the differences between rack:1 and rack:2 using
> trybots, but didn't have much luck. Hopefully whatever issue that was
> causing differences has gone away, but if not, hopefully it will be
> easier to identify the differences using Perf.
> 
> Change-Id: If9b16e8e247737cfc61bf00629eb68b8751bbf3a
> Reviewed-on: https://skia-review.googlesource.com/156500
> Reviewed-by: Kevin Lubick <kjlubick@google.com>
> Commit-Queue: Ben Wagner <benjaminwagner@google.com>

TBR=benjaminwagner@google.com,kjlubick@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: Icc89ef83d0f981d22edb15ef934ac07ba1ab5bf3
Reviewed-on: https://skia-review.googlesource.com/157221
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
2 files changed