cft: fix first level of import on new builders

Need to properly append the src detection to the entry point

BUG=None
TEST=./test/python/src/docker_libs/cli/build-dockerimages.py

Change-Id: I411b44f04c37d41cb9e2ee534197f3e542dd139f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/3621940
Tested-by: Derek Beckett <[email protected]>
Reviewed-by: Jaques Clapauch <[email protected]>
1 file changed