Updated Javadoc of AntClassLoader2.
JUnit 4.
The JNLP port is not interesting enough to warrant logging at INFO during every startup, including the vast majority of functional tests which do not even use JNLP slaves.
Toning down some uninteresting logging which just clutters test runs.
[JENKINS-14749] Temporarily work around CSS errors by just suppressing the warnings until they can be fixed.