tests: use a Argonne DNS entry instead of a boisvert.info DNS entry

The new Jenkins address is:
http://jenkins-biosal.mcs.anl.gov:8080/

John Roberts at CELS Systems added the DNS entry.

Link: [mcs-systems #239141] DNS entry for a Jenkins Continuous Integration website
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
message_multiplexer: increase the predicted message count when possible

Link: https://github.com/GeneAssembly/biosal/issues/805
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>