always tee test linuxkit run to tty, so if it gets stuck, we see why (#4107)

Signed-off-by: Avi Deitcher <avi@deitcher.net>

test/cases/040_packages/009_init_containerd/test.sh

@@ -17,7 +17,7 @@ trap clean_up EXIT
 
 # Test code goes here
 linuxkit build --format kernel+initrd --name "${NAME}" test.yml
-RESULT="$(linuxkit run $NAME)"
+RESULT="$(linuxkitrun $NAME)"
 echo "${RESULT}"
 echo "${RESULT}" | grep -q "suite PASSED"