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/DefaultDatabase.java b/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DefaultDatabase.java
index 9ffd1e8..c14e57c 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DefaultDatabase.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DefaultDatabase.java
@@ -61,6 +61,11 @@
     }
 
     @Override
+    public CompletableFuture<Set<String>> tableNames() {
+        return checkOpen(() -> proxy.tableNames());
+    }
+
+    @Override
     public CompletableFuture<Integer> size(String tableName) {
         return checkOpen(() -> proxy.size(tableName));
     }