tests/rv_clearx.py: Removing clearx

It's a lot better to clean interface from rv_connect

Signed-off-by: Tomas Jamrisko <tjamrisk@redhat.com>
cfg/tests-spice.cfg, tests/cfg/spice.cfg: Add tests related to proxy and file

This defines several tests for proxy and vv file connection.

Signed-off-by: Tomas Jamrisko <tjamrisk@redhat.com>
tests/rv_connect.py: Add support for proxy, file and prepare windows client

This patch changes how remote-viewer is executed, so that we can get
it to work on windows machines, with proxy and connecting using
a provided file.

Signed-off-by: Tomas Jamrisko <tjamrisk@redhat.com>
virttest/utils_spice.py: Adding several functions.

Adding functions to install remote-viewer on windows client,
to generate a file with information required for connection
and also restarting of user interface on any VM (so far
linux olny)

Signed-off-by: Tomas Jamrisko <tjamrisk@redhat.com>