Implement command to view Raft partitions

Change-Id: I9d3cea49877d69c2d7935dadbbad2770349e793a
diff --git a/core/api/src/main/java/org/onosproject/store/service/StorageAdminService.java b/core/api/src/main/java/org/onosproject/store/service/StorageAdminService.java
new file mode 100644
index 0000000..427b953
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/store/service/StorageAdminService.java
@@ -0,0 +1,31 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.store.service;
+
+import java.util.List;
+
+/**
+ * Service for administering storage instances.
+ */
+public interface StorageAdminService {
+
+    /**
+     * Returns information about all partitions in the system.
+     *
+     * @return list of partition information
+     */
+    List<PartitionInfo> getPartitionInfo();
+}