tests: add a script to test without the multiplexer

Link: https://github.com/GeneAssembly/biosal/issues/808
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: remove empty line in multiplexer code

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: simplify code path for multiplexing

Link: https://github.com/GeneAssembly/biosal/issues/808
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: remove unused multiplexer configuration option

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