Merge pull request #73 from lnussel/master

fix username and password defaults
we don't need no crypt any more
translate prints in qemu backend to diag calls, so they appear in log file
readd an assert_and_click function
Merge pull request #74 from os-autoinst/coolo_vnc

implement needling clicking through VNC
undo debug changes of commit 1af801e
die if sending a keypress fails