Revert "When CQ-master destructs itself, it needs to record ignored slaves."

This reverts commit c034a38e7c53335bf844b4912aa54560739c3a1d.

Reason for revert: chromium:711554

Original change's description:
> When CQ-master destructs itself, it needs to record ignored slaves.
> 
> When self-destruction is triggered, for each uncompleted slave builds,
> the master build will insert a message with the slave build_id as the
> value into the buildMessageTable. The slave builds may pass, fail or
> abort after the master destructs itself.
> 
> BUG=chromium:707894
> TEST=unit_tests
> 
> Change-Id: I75e4d946cd51600343ebda94fe58438a6837d159
> Reviewed-on: https://chromium-review.googlesource.com/471849
> Commit-Ready: Ningning Xia <nxia@chromium.org>
> Tested-by: Ningning Xia <nxia@chromium.org>
> Reviewed-by: Aviv Keshet <akeshet@chromium.org>
> 

TBR=dgarrett@chromium.org,akeshet@chromium.org,davidriley@chromium.org,nxia@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:707894

Change-Id: Iee1c46f8ab205aa0e5a6fb8aa415f09888c1ce9a
Reviewed-on: https://chromium-review.googlesource.com/477440
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Tested-by: Ningning Xia <nxia@chromium.org>
4 files changed