roachtest: replicagc-changed-peers/noRestart failed

[cockroach-teamcity]

SHA: https://github.com/cockroachdb/cockroach/commits/9671342fead0509bec0913bae4ae1f244660788e

Parameters:

To repro, try:

# Don't forget to check out a clean suitable branch and experiment with the
# stress invocation until the desired results present themselves. For example,
# using stress instead of stressrace and passing the '-p' stressflag which
# controls concurrency.
./scripts/gceworker.sh start && ./scripts/gceworker.sh mosh
cd ~/go/src/github.com/cockroachdb/cockroach && \
stdbuf -oL -eL \
make stressrace TESTS=replicagc-changed-peers/noRestart PKG=roachtest TESTTIMEOUT=5m STRESSFLAGS='-maxtime 20m -timeout 10m' 2>&1 | tee /tmp/stress.log

Failed test: https://teamcity.cockroachdb.com/viewLog.html?buildId=1298500&tab=buildLog

The test failed on branch=release-19.1, cloud=gce:
	cluster.go:1474,replicagc.go:73,replicagc.go:37,test.go:1251: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/bin/roachprod run teamcity-1298500-replicagc-changed-peers-norestart:1 -- ./workload run kv {pgurl:1} --init --max-ops=1 --splits 100 returned:
		stderr:
		
		stdout:
		I190521 11:30:15.766389 1 workload/workload.go:562  starting 100 splits
		Error: ALTER TABLE kv SPLIT AT VALUES (91320515216384000): pq: splits would be immediately discarded by merge queue; disable the merge queue first by running 'SET CLUSTER SETTING kv.range_merge.queue_enabled = false'
		Error:  ssh verbose log retained in /root/.roachprod/debug/ssh_35.231.159.241_2019-05-21T11:30:14Z: exit status 1
		: exit status 1

[nvanbenschoten]

Fixed by #37684.