Enable the slave client to connect without authentication for compatibility with 3.4 and older QVD versions

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@22573 4046b530-fbad-4e16-af16-ee11f0b55167
Pass authorization code to VMA only if it has been provided

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@22581 4046b530-fbad-4e16-af16-ee11f0b55167
Don't pass default host and port to slave client, let the slave client figure them out itself

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@22582 4046b530-fbad-4e16-af16-ee11f0b55167
Added missing "use Errno".

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@22585 4046b530-fbad-4e16-af16-ee11f0b55167