thorium: remove unused variables in multiplexer

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: remove unused variables in multiplexer buffer

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: remove unused buffer in actor

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: add function to get triage queue size

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: drain more objects in worker

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: remove unused variable in thorium_node

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: drain more objects in node

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