fix dht.query command and thus dht test

Author: ianopolous

src/main/java/io/ipfs/api/IPFS.java

@@ -397,8 +397,8 @@ public Map findprovs(Multihash hash) throws IOException {
             return retrieveMap("dht/findprovs?arg=" + hash);
         }
 
-        public Map query(MultiAddress addr) throws IOException {
-            return retrieveMap("dht/query?arg=" + addr.toString());
+        public Map query(Multihash peerId) throws IOException {
+            return retrieveMap("dht/query?arg=" + peerId.toString());
         }
 
         public Map findpeer(Multihash id) throws IOException {

src/test/java/io/ipfs/api/APITest.java

@@ -613,7 +613,7 @@ public void dhtTest() throws IOException {
         Map put = ipfs.dht.put("somekey", "somevalue");
         Map findprovs = ipfs.dht.findprovs(pointer);
         List<Peer> peers = ipfs.swarm.peers();
-        Map query = ipfs.dht.query(peers.get(0).address);
+        Map query = ipfs.dht.query(peers.get(0).id);
         Map find = ipfs.dht.findpeer(peers.get(0).id);
     }