Reduce min_num_instances of sheriff-config
Reduce min_num_instances of sheriff-config

We have already remove the sheriff-config from critical path. So QPS is
largely reduced from 10 to <1. Reduce min_num_instances of
sheriff-config from 10 to 3 which should be enough for now.

Change-Id: I22772a9463d7280e4f1d269245a83ce0d1c98fbc
Reviewed-on: https://chromium-review.googlesource.com/c/catapult/+/2006841
Auto-Submit: Chenlin Fan <ade7e59805b81f027d537665b2c12c1956198b97@chromium.org>
Reviewed-by: Dean Berris <34a37f59e4ade3cf49221306f04217acf3e86255@chromium.org>
Commit-Queue: Dean Berris <34a37f59e4ade3cf49221306f04217acf3e86255@chromium.org>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult