thorium_actor: discard debug message

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium_worker: include the constants header

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
performance: add messaging rate at different levels

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