Added a basic authentication mechanism for slave connections.

The L7R generates a random cookie/key and passes it to the VMA and to the qvd client. The client must provide the cookie for any transaction. This should make the slave channel mechanism a little safer when several users share the client machine.

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@22056 4046b530-fbad-4e16-af16-ee11f0b55167
hook L7R from the HKD

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@22060 4046b530-fbad-4e16-af16-ee11f0b55167
L7R doesn't like talking over a non-blocking socket

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@22061 4046b530-fbad-4e16-af16-ee11f0b55167
rework HKD and L7R dependencies and remove old L7R binaries

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@22062 4046b530-fbad-4e16-af16-ee11f0b55167