tools: Use JBoss modules instead of class path

Currently in order to run the tools we build the class path using mostly
the "build-classpath" script and also some ad hoc searches. This tends
to fail in environments where the jar files are installed in locations
different than expected. This patch changes the scripts that starts
the tools so that they use the JBoss modules launcher instead, thus
manual class path building is no longer required.

Change-Id: I32a6ed83071ec4243cfe468f87ad98d4f31d503d
Signed-off-by: Juan Hernandez <juan.hernandez@redhat.com>
(cherry picked from commit 028ff6b8eb74f532f0d001382d19e21e488d9527)