Disable all AbstractAccumulator tests.

These are timing sensitive and fail randomly all the time.

Change-Id: Ie22fa93468ee7a7642a0236275c5d6838e3cc363
diff --git a/utils/misc/src/test/java/org/onlab/util/AbstractAccumulatorTest.java b/utils/misc/src/test/java/org/onlab/util/AbstractAccumulatorTest.java
index 4a7130e..421fa7a 100644
--- a/utils/misc/src/test/java/org/onlab/util/AbstractAccumulatorTest.java
+++ b/utils/misc/src/test/java/org/onlab/util/AbstractAccumulatorTest.java
@@ -40,6 +40,7 @@
         assertEquals("incorrect idle ms", 70, accumulator.maxIdleMillis());
     }
 
+    @Ignore("FIXME: timing sensitive test failing randomly.")
     @Test
     public void eventTrigger() {
         TestAccumulator accumulator = new TestAccumulator();
@@ -73,6 +74,7 @@
         assertEquals("incorrect batch", "abcd", accumulator.batch);
     }
 
+    @Ignore("FIXME: timing sensitive test failing randomly.")
     @Test
     public void idleTrigger() {
         TestAccumulator accumulator = new TestAccumulator();
@@ -84,6 +86,7 @@
         assertEquals("incorrect batch", "ab", accumulator.batch);
     }
 
+    @Ignore("FIXME: timing sensitive test failing randomly.")
     @Test
     public void readyIdleTrigger() {
         TestAccumulator accumulator = new TestAccumulator();
@@ -99,6 +102,7 @@
         assertEquals("incorrect batch", "ab", accumulator.batch);
     }
 
+    @Ignore("FIXME: timing sensitive test failing randomly.")
     @Test
     public void readyLongTrigger() {
         TestAccumulator accumulator = new TestAccumulator();