Improve ThreadPoolManagerTest stability (#4035)

When the CPU load of a system is high these timeouts may not be realistic.

Fixes #3254

Signed-off-by: Wouter Born <github@maindrain.net>

bundles/org.openhab.core/src/test/java/org/openhab/core/common/ThreadPoolManagerTest.java

@@ -125,15 +125,15 @@ private void checkThreadPoolWorks(String poolName) throws InterruptedException {
         ExecutorService threadPool = ThreadPoolManager.getPool(poolName);
         CountDownLatch cdl = new CountDownLatch(1);
         threadPool.execute(cdl::countDown);
-        assertTrue(cdl.await(1, TimeUnit.SECONDS), "Checking if thread pool " + poolName + " works");
+        assertTrue(cdl.await(5, TimeUnit.SECONDS), "Checking if thread pool " + poolName + " works");
         assertFalse(threadPool.isShutdown(), "Checking if thread pool is not shut down");
     }
 
     private void checkScheduledPoolWorks(String poolName) throws InterruptedException {
         ScheduledExecutorService threadPool = ThreadPoolManager.getScheduledPool(poolName);
         CountDownLatch cdl = new CountDownLatch(1);
         threadPool.schedule(cdl::countDown, 100, TimeUnit.MILLISECONDS);
-        assertTrue(cdl.await(1, TimeUnit.SECONDS), "Checking if thread pool " + poolName + " works");
+        assertTrue(cdl.await(5, TimeUnit.SECONDS), "Checking if thread pool " + poolName + " works");
         assertFalse(threadPool.isShutdown(), "Checking if thread pool is not shut down");
     }
 }