JMX tracing code should use java.util.logging directly

Currently JMX has compatibility code that works with pre-J2SE-1.4
where the java.util.logging package did not exist. This code is
obviously not necessary when JMX is integrated into J2SE 1.5, so
it should be removed there. Tracing code should call java.util.logging
directly, or there should be at most one utility class that centralizes
this.