Set cts-tradefed paths to absolute

Setting the CTS_ROOT path to absolute in cts-tradefed allows to run the script
from different location.

Test: run CTS manually

Change-Id: I311fe0b8286e7a40db34dd137f4af949e9936c65
Signed-off-by: Milosz Wasilewski <milosz.wasilewski@linaro.org>
1 file changed