Problem

--- FAIL: TestGetSubscriptionsRPC (0.37s)
    streamer_test.go:1332: Real subscriptions and expected amount don't match; real: 1, expected: 8

Flaky ratio

     20 FAIL
    980 PASS

Note: because of #1233 I did not get a 1000 runs as originally intended.

How to reproduce

time go test -v -race -run TestGetSubscriptionsRPC -count 1000 github.com/ethereum/go-ethereum/swarm/network/stream

Note: The test seems to be stable without -race.