log if downloading from a mvn repo failed. This especialy needed, if more than one URL are configured. This will greatly improve the Maven anti-experience we are used to, telling something is downloading, but in fact, it won't.


git-svn-id: http://sbuild.tototec.de/svn/sbuild/trunk@400 024a02f7-42f7-40fc-9f58-65666d1f2450