Add empty post_test_hook script
Add empty post_test_hook script

This patch just adds a empty post_test_hook.sh to allow project-config
script pass. Later it will be rewrite.

Change-Id: Ia547c8d3efbf6f6271622434f9613481b7bbee3d

kevin-zhaoshuai/zun,kevin-zhaoshuai/zun,kevin-zhaoshuai/zun