Revert of Shard memcache key for a list of CQs (patchset #1 id:1 of https://codereview.chromium.org/1333063002/ )
Revert of Shard memcache key for a list of CQs (patchset #1 id:1 of https://codereview.chromium.org/1333063002/ )

Reason for revert:
this increases complexity and doesn't solve an actual problem as no actual slowdown was noticed on Rietveld

Original issue's description:
> Shard memcache key for a list of CQs
>
> This avoids requests hitting the same memcache server over and over again, see
> https://cloud.google.com/appengine/articles/best-practices-for-app-engine-memcache#distribute_load_across_the_keyspace
> for more details.
>
> R=iannucci@chromium.org,jrobbins@chromium.org
>
> Committed: https://chromium.googlesource.com/infra/infra/+/d09a6280ceac796ba5a11082096cab13a30dd384

TBR=iannucci@chromium.org,jrobbins@chromium.org,jrobbins@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1345523004

nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra