Add secondary vhosts for HTTPS to each mailman site, but don't
remove the plain HTTP ones for now. Before switching to Mailman 3
we'll replace the current HTTP vhosts with blanket redirects to
HTTPS.
Add tests to make sure this is working, and also add a command-line
test for the lists.openinfra.dev site now that it's got a first
non-default list of its own. Also collect Apache logs from the test
nodes so we can see for sure what might break.
Change-Id: I4d93d643381f17c9a968595587909f0ba3dd6f92