replicaof no one on returns after long time while running memtier on master

[adiholden]

Describe the bug
Running replicaof no one on replica in full sync state returns after more than 20 seconds

To Reproduce
run master and replica
./dragonfly --alsologtostderr --dbfilename= --port=6379
./dragonfly --alsologtostderr --dbfilename= --port=6380

run memtier on master
memtier_benchmark -c 10 -t 8 --pipeline=30 --hide-histogram --test-time=3000 --distinct-client-seed -d 256 --ratio=1:0
and wait a little for master to fill with data

run command on replica
replicaof localhost 6379
and after
replicaof no one

Expected behavior
replica of no one should return fast

[dranikpg]

we already had an issue for this around a year ago

[safa-topal]

Probably related: #2907

[BorysTheDev]

Probably related: #2907

it's a different problem