Added support for "maps" cli command that displays meta information for various consistent maps in the system

Change-Id: I63e590a8520ac9d1238efe4ad0033dcba939e472
diff --git a/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DatabaseState.java b/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DatabaseState.java
index 1863496..097261d 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DatabaseState.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DatabaseState.java
@@ -44,6 +44,9 @@
   public void init(StateContext<DatabaseState<K, V>> context);
 
   @Query
+  Set<String> tableNames();
+
+  @Query
   int size(String tableName);
 
   @Query