When execute EVAL command in cluster mode, 'All Stats' output contains zeros for all the columns except 'Latency'

[godjoem]

It's a similar issue as #128
When running memtier_benchmark with EVAL command in cluster mode. (It's fine when running on a standalone Redis)
The command:

memtier_benchmark -s 127.0.0.1 -p 6380 -c 10 -n 100 --cluster-mode \
  --key-prefix={account}: --key-minimum=1 --key-maximum=10000 \
  --command='EVAL "return redis.call(\"SET\", KEYS[1], ARGV[1])" 1 __key__ __data__' \
  --command-key-pattern=P

Output:

ALL STATS
============================================================================================================================
Type         Ops/sec    MOVED/sec      ASK/sec    Avg. Latency     p50 Latency     p99 Latency    p100 Latency       KB/sec 
----------------------------------------------------------------------------------------------------------------------------
Evals           0.00         0.00         0.00         0.54092         0.39100         3.05500        12.41500         0.00 
Totals          0.00         0.00         0.00         0.54092         0.39100         3.05500        12.41500         0.00 

I use memtier_benchmark 2.1.1 and run Redis cluster in docker containers (latest Redis image).

The output is fine when running the command in #128
memtier_benchmark --clients=50 --threads=4 --requests=10000 --data-size-range=32-1000 --pipeline=100 --ratio=5:5 -p 6380 --cluster-mode

I found that this problem occurs when I execute the EVAL command on a Redis cluster.