Fix two race conditions in the custom log manager test.
- Remove possibility of false positives by blocking until jmx thread
sends statsd metrics
- Disable logging in test to avoid deadlock in jmxfetch which can
occur when the JVM shuts down too quickly
This was weird having it as a separate project. Reduces the number of top level directories.
There weren’t any existing tests in dd-java-agent’s test directory, so this seemed like a good place to put them.