travis/gitlab/azure: Simplify the exit code for test.py

travis/gitlab/azure: Simplify the exit code for test.py

It seems unnecessary to read the exit code and then check it again. Drop
this and just let the test.py provide the exit code directly.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>