list L7R host on qvd-admin vm list

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@22276 4046b530-fbad-4e16-af16-ee11f0b55167
Fix  #1432: show server error message for HTTP_SERVICE_UNAVAILABLE

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@22282 4046b530-fbad-4e16-af16-ee11f0b55167