Make the loopback test fail when the background loopback thread
fails.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

This patch changes the GuestWorker to run on windows and adjusts
virtio_console test also to support windows testing.

Currently supported tests are:
* open
* multiopen
* close
* max_serials_and_conosles (windows won't initialize consoles. I need
           to check it with the developer if this is a bug or feature)
* rw_host_offline (fails, need to check with developer the expected
                   results)
* basic_loopback (fails, data are corrupted)
* loopback (fails, data are corrupted)
* migrate (fails, data are corrupted)
* hotplug (fails, windows won't initialize consoles properly)
* shutdown

Beware on my laptop in 50% the ports were not initialized properly,
VM reboot usually helped (not always). You might use "Winobj" program
to list \\Device\vport* ports or \\.\$port_name devices/symlinks.

I checked the data corruption and it happends (winXP->Fedora18)
pretty regularly even with Amit's C++ testing script.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

Fixes the incorrect function prefix in migrate virtio_console test.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

Signed-off-by: NLucas Meneghel Rodrigues <lmr@redhat.com>

Signed-off-by: NLucas Meneghel Rodrigues <lmr@redhat.com>