Increasing the timeout termination

Author: nhachicha

driver-sync/src/test/functional/com/mongodb/client/ServerDiscoveryAndMonitoringProseTests.java

@@ -329,7 +329,7 @@ public void connectionPoolCleared(final ConnectionPoolClearedEvent event) {
 
             // Wait for all operations to complete (max 10 seconds)
             executor.shutdown();
-            boolean terminated = executor.awaitTermination(10, SECONDS);
+            boolean terminated = executor.awaitTermination(20, SECONDS);
             assertTrue("Executor did not terminate within timeout", terminated);
 
             // Assert at least 10 ConnectionCheckOutFailedEvents occurred