unitTest/scheduler: Increase timeout

2 seconds is too short on some system to spawn 1024 threads.  Increase this by a
second.  This is highly system dependent and we might want to change the logic
of the test instead.

Gitlab: #545
Change-Id: Id939ad4809e47a2cdce19885387464289110e137

test/unitTest/scheduler.cpp

@@ -71,14 +71,14 @@ SchedulerTest::schedulerTest()
     for (unsigned i=0; i<N; i++)
         executor.run(task);
 
-    CPPUNIT_ASSERT(cv.wait_for(lk, std::chrono::seconds(2), [&]{
+    CPPUNIT_ASSERT(cv.wait_for(lk, std::chrono::seconds(3), [&]{
         return taskRun == N;
     }));
 
     for (unsigned i=0; i<N; i++)
         executor.scheduleIn(task, std::chrono::microseconds(1));
 
-    CPPUNIT_ASSERT(cv.wait_for(lk, std::chrono::seconds(2), [&]{
+    CPPUNIT_ASSERT(cv.wait_for(lk, std::chrono::seconds(3), [&]{
         return taskRun == 2 * N;
     }));