Rotation test should be tested from normal to all orientation

[Po-Hsu Lin]

Currently we are testing the display rotation with:

def main():
    screen = xrandr.get_current_screen()
    rotations = {'normal': xrandr.RR_ROTATE_0,
                 'right': xrandr.RR_ROTATE_90,
                 'inverted': xrandr.RR_ROTATE_180,
                 'left': xrandr.RR_ROTATE_270}
    rots_statuses = {}

    for rot in rotations:
        try:
            status = rotate_screen(rotations[rot])

I think we should test it explicitly with:
normal -> right
normal -> inverted
normal -> left

So that we will be able to capture issues like: bug 1446979 and bug 1443345.
And it's more close to what a normal user will do on their system.

[Po-Hsu Lin (cypressyew)]

With Pierre's new rotation script (with dbus) it's super easy to do this.

Just need to change the orientation index from
    for i in 2 4 8 1
to
    for i in 2 1 4 1 8 1