Increase Kafka receive patience to 30s

When receiving messages from Kafka in our tests, they may come
a bit later than we thought and we risk to make tests flaky.

Limit raised to 30s for declaring that we have not received a message
and thus the test must fail.

Change-Id: If9b738e38143eb1bce242343c3e4e3b0efeecc64
1 file changed