Fix travis configuration

Author: lindong28

.travis.yml

@@ -1,6 +1,4 @@
 language: java
 
 jdk:
-  - oraclejdk7
-  - openjdk7
   - oraclejdk8

src/main/java/com/linkedin/kmf/services/ProduceService.java

@@ -165,8 +165,8 @@ private void initializeStateForPartitions(int partitionNum) {
         _sensors.addPartitionSensors(partition);
       }
       _produceExecutor.scheduleWithFixedDelay(new ProduceRunnable(partition, key), _produceDelayMs, _produceDelayMs, TimeUnit.MILLISECONDS);
-      _partitionNum.set(partitionNum);
     }
+    _partitionNum.set(partitionNum);
   }
 
   private Map<Integer, String> generateKeyMappings(int partitionNum) {
@@ -367,4 +367,4 @@ public Thread newThread(Runnable r) {
     }
   }
 
-}
+}