Add version to agent registration message

Signed-off-by: David Goulet <dgoulet@efficios.com>
[HEAD MERGE] Test: Add Java agent log4j and use new java agent

This adds the log4j java agent test.

It also moves the JUL test and build system to use the new UST java
agent jar.

FIXME: This commit still hardcode the path to log4j 1.2 jar file on an
Ubuntu system.

Signed-off-by: David Goulet <dgoulet@efficios.com>
[MERGE] add Java m4 macro and detect log4j in configure

Signed-off-by: David Goulet <dgoulet@efficios.com>
[MERGE] Use javaflags in buildsystem for classpath

Signed-off-by: David Goulet <dgoulet@efficios.com>