thorium: add message count target for transport

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium_node: add custom tracepoint function

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
scripts: add a script to test with TCP

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>