Minor DB updates

A node can support multiple streams. Unfortunately, an address can't so there might be multiple entries of the same address for different streams.
Also, store object types. I think we'll need them later, specially in search for public keys we requested.

inventory/src/main/resources/db/migration/V1.0__Create_node_table.sql

@@ -1,9 +1,9 @@
 CREATE TABLE Node (
   ip       BINARY(16) NOT NULL,
   port     INT        NOT NULL,
-  services BIGINT     NOT NULL,
   stream   BIGINT     NOT NULL,
+  services BIGINT     NOT NULL,
   time     BIGINT     NOT NULL,
 
-  PRIMARY KEY (ip, port)
+  PRIMARY KEY (ip, port, stream)
 );

inventory/src/main/resources/db/migration/V1.1__Create_inventory_table.sql

@@ -3,5 +3,6 @@ CREATE TABLE Inventory (
   stream  BIGINT     NOT NULL,
   expires BIGINT     NOT NULL,
   data    BLOB       NOT NULL,
+  type    BIGINT     NOT NULL,
   version INT        NOT NULL
 );