make unit test stable (#1805)

Author: beiwei30

dubbo-common/src/test/java/com/alibaba/dubbo/common/threadpool/support/cached/CachedThreadPoolTest.java

@@ -66,7 +66,7 @@ public void run() {
             }
         });
 
-        latch.await(5000, TimeUnit.MICROSECONDS);
+        latch.await();
         assertThat(latch.getCount(), is(0L));
     }
 

dubbo-common/src/test/java/com/alibaba/dubbo/common/threadpool/support/eager/EagerThreadPoolTest.java

@@ -67,7 +67,7 @@ public void run() {
             }
         });
 
-        latch.await(5000, TimeUnit.MICROSECONDS);
+        latch.await();
         assertThat(latch.getCount(), is(0L));
     }
 

dubbo-common/src/test/java/com/alibaba/dubbo/common/threadpool/support/fixed/FixedThreadPoolTest.java

@@ -67,7 +67,7 @@ public void run() {
             }
         });
 
-        latch.await(5000, TimeUnit.MICROSECONDS);
+        latch.await();
         assertThat(latch.getCount(), is(0L));
     }
 

dubbo-common/src/test/java/com/alibaba/dubbo/common/threadpool/support/limited/LimitedThreadPoolTest.java

@@ -65,7 +65,7 @@ public void run() {
             }
         });
 
-        latch.await(5000, TimeUnit.MICROSECONDS);
+        latch.await();
         assertThat(latch.getCount(), is(0L));
     }