tests: fix root downloading url
tests: fix root downloading url

Now it's generated with current date
Signed-off-by: Alexander Burluka <e1a296dbcd92383e62ed2d193750f7aed5ae3091@parallels.com>

LK4D4/libct,LK4D4/libct,avagin/libct,xemul/libct,avagin/libct,xemul/libct,xemul/libct,hallyn/libct,xemul/libct,LK4D4/libct,hallyn/libct,hallyn/libct,avagin/libct