Adding a zoom normal test.

Signed-off-by: Vimal Patel <vipatel@redhat.com>
Adding the zoom normal test, added some verifications into rv_gui.

Verify the resolution of the guest does not change.
Verify that the window size of rv is the same as the original window when rv was brought up before any zooming.

Signed-off-by: Vimal Patel <vipatel@redhat.com>