tests: revert the DNS address

Works 100% of the time:
http://jenkins.biosal.anl.boisvert.info:8080/

Works sometimes (there is some DNS propagation issue):
http://jenkins-biosal.mcs.anl.gov:8080/

These 2 addresses point to the same thing.

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