Revert "Fix nasty race condition in the MeterStore"

This reverts commit 6ef84ceb0e167e4bff0fb3fdf9ca29abba56a465.

Reason for revert: let me update the commit message

Change-Id: Ia1ee1cb33544eb2249e225e574c7f27a04095e56
diff --git a/core/store/dist/src/main/java/org/onosproject/store/meter/impl/DistributedMeterStore.java b/core/store/dist/src/main/java/org/onosproject/store/meter/impl/DistributedMeterStore.java
index 30da74d..b94375c 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/meter/impl/DistributedMeterStore.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/meter/impl/DistributedMeterStore.java
@@ -114,8 +114,7 @@
 
     // Meters id related objects
     private static final String AVAILABLEMETERIDSTORE = "onos-meters-available-store";
-    protected final ConcurrentMap<MeterTableKey, DistributedSet<MeterKey>> availableMeterIds =
-            new ConcurrentHashMap<>();
+    protected ConcurrentMap<MeterTableKey, DistributedSet<MeterKey>> availableMeterIds;
     private static final String METERIDSTORE = "onos-meters-id-store";
     private AtomicCounterMap<MeterTableKey> meterIdGenerators;
 
@@ -178,6 +177,8 @@
                 .withSerializer(APP_KRYO_BUILDER).build();
         metersFeatures.addListener(featuresMapListener);
 
+        availableMeterIds = new ConcurrentHashMap<>();
+
         meterIdGenerators = storageService.<MeterTableKey>atomicCounterMapBuilder()
                 .withName(METERIDSTORE)
                 .withSerializer(Serializer.using(KryoNamespaces.API,