prepare for path based configuration

other/java/client/src/main/proto/filer.proto

@@ -348,3 +348,11 @@ message KvPutRequest {
 message KvPutResponse {
     string error = 1;
 }
+
+// path-based configurations
+message FilerPathConfiguration {
+    string location = 1;
+    string collection = 2;
+    string replication = 3;
+    string ttl = 4;
+}