thorium: add messages per second in workers with -print-thorium-data

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: remove EPOCH entry from log

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: add separator with -print-thorium-data

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium_transport: add functions to get current and maximum throughputs

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