[SPARK-8634][Streaming][Tests]Fix flaky test StreamingListenerSuite "receiver info reporting" #7017
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As per the unit test log in https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/35754/
it needs at least 4 seconds to receive all receiver events in this slow machine, but
timeout
foreventually
is only 2 seconds.This PR increases
timeout
to make this test stable.