Deploying a webmodule to "/" has stopped working as of the nightly that was
generated between 12/08 and 12/09.
asadmin deploy --contextroot "/" test.war
issued against a newly created domain, now fails with this error:
CLI171 Command deploy failed : Trying to create reference for application in
target server failed; The context root  in application [test] is already in
use by another application on this instance [server]
This error message can't be true, because "server" does not have any webapps
deployed to its "/", nor does it declare any default-web-module.
Several of the web unit tests have started failing because of this.