[NO ISSUE][TEST] increase result sender thread exit wait time

- user model changes: no
- storage format changes: no
- interface changes: no

Details:

- Increase the time to wait for the result sender thread
  to exit from 5 to 30 seconds to avoid intermittent test
  failures.

Change-Id: If675fd655519a23eb0e56d59d6680a36c0832b3b
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/7763
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Murtadha Hubail <mhubail@apache.org>
Reviewed-by: Hussain Towaileb <hussainht@gmail.com>
diff --git a/asterixdb/asterix-app/src/test/java/org/apache/asterix/test/runtime/ResultStreamingFailureTest.java b/asterixdb/asterix-app/src/test/java/org/apache/asterix/test/runtime/ResultStreamingFailureTest.java
index 3a4823f..c4fca1a 100644
--- a/asterixdb/asterix-app/src/test/java/org/apache/asterix/test/runtime/ResultStreamingFailureTest.java
+++ b/asterixdb/asterix-app/src/test/java/org/apache/asterix/test/runtime/ResultStreamingFailureTest.java
@@ -58,7 +58,7 @@
     public void resultStreamingFailureTest() throws Exception {
         queryAndDropConnection();
         // allow result sender to terminate and ensure no leaks
-        Span timeout = Span.start(5, TimeUnit.SECONDS);
+        Span timeout = Span.start(30, TimeUnit.SECONDS);
         while (!timeout.elapsed()) {
             String threadDump = ThreadDumpUtil.takeDumpString();
             if (!threadDump.contains(ResultPartitionReader.class.getName())) {