Network Service Discovery test: properly release resources

Bug: 32561414
Bug: 62918393
Bug: 62044295
Test: runtest frameworks-net
Change-Id: If23993b5e391947ecbdc01677f0a643144794b2b

tests/net/java/com/android/server/NsdServiceTest.java

@@ -95,6 +95,9 @@ public class NsdServiceTest {
         client2.disconnect();
 
         verify(mDaemon, timeout(mTimeoutMs).times(1)).stop();
+
+        client1.disconnect();
+        client2.disconnect();
     }
 
     @Test
@@ -131,6 +134,8 @@ public class NsdServiceTest {
 
         // checks that request are cleaned
         verifyDaemonCommands("stop-register 2", "stop-discover 3", "stop-resolve 4");
+
+        client.disconnect();
     }
 
     NsdService makeService() {