Improve logging of failed presence extensions

Don't log the exception for now because the stack trace makes to much
noise in the log output. This is mostly caused by Googles outdated
Entity Capabilities implementation.

smack-core/src/main/java/org/jivesoftware/smack/util/PacketParserUtils.java

@@ -578,9 +578,8 @@ public class PacketParserUtils {
                     try {
                         PacketParserUtils.addExtensionElement(presence, parser, elementName, namespace);
                     } catch (Exception e) {
-                        LOGGER.log(Level.WARNING,
-                                        "Failed to parse extension packet in Presence packet. Attributes: from="
-                                                        + presence.getFrom() + " id=" + presence.getStanzaId(), e);
+                        LOGGER.warning("Failed to parse extension element in Presence stanza: \"" + e + "\" from: '"
+                                        + presence.getFrom() + " id: '" + presence.getStanzaId() + "'");
                     }
                     break;
                 }