Enable javadoc checkstyle

and fix violations.

smack-core/src/test/java/org/jivesoftware/smack/ThreadedDummyConnection.java

@@ -30,7 +30,7 @@ import org.jivesoftware.smack.packet.Stanza;
 import org.jivesoftware.smack.packet.IQ.Type;
 
 /**
- * 
+ * A threaded dummy connection.
  * @author Robin Collier
  *
  */

smack-core/src/test/java/org/jivesoftware/smack/filters/FilterToStringTest.java

@@ -24,9 +24,6 @@ import org.jivesoftware.smack.filter.StanzaIdFilter;
 import org.jivesoftware.smack.filter.ThreadFilter;
 import org.junit.Test;
 
-/**
- * 
- */
 public class FilterToStringTest {
 
     @Test

smack-core/src/test/java/org/jivesoftware/smack/filters/FromMatchesFilterTest.java

@@ -27,7 +27,7 @@ import org.jxmpp.jid.Jid;
 import org.jxmpp.jid.JidTestUtil;
 
 /**
- * 
+ * From matches filter test.
  * @author Robin Collier
  *
  */

smack-core/src/test/java/org/jivesoftware/smack/packet/MessageTest.java

@@ -30,9 +30,6 @@ import java.util.Collection;
 import java.util.List;
 import java.util.ArrayList;
 
-/**
- *
- */
 public class MessageTest {
 
     @Test

smack-core/src/test/java/org/jivesoftware/smack/packet/PresenceTest.java

@@ -27,9 +27,6 @@ import org.xml.sax.SAXException;
 
 import java.io.IOException;
 
-/**
- *
- */
 public class PresenceTest {
     @Test
     public void setPresenceTypeTest() throws IOException, SAXException {

smack-core/src/test/java/org/jivesoftware/smack/util/PacketParserUtilsTest.java

@@ -47,9 +47,6 @@ import org.xmlpull.v1.XmlPullParserException;
 
 import com.jamesmurty.utils.XMLBuilder;
 
-/**
- *
- */
 public class PacketParserUtilsTest {
 
     private static Properties outputProperties = new Properties();