CI: Add automatic retry for test.py jobs

It is not uncommon for some of the QEMU-based jobs to fail not because
of a code issue but rather because of a timing issue or similar problem
that is out of our control. Make use of the keywords that Azure and
GitLab provide so that we will automatically re-run these when they fail
2 times. If they fail that often it is likely we have found a real issue
to investigate.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index cfd5851..f7ffb8f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -20,6 +20,7 @@
 
 .buildman_and_testpy_template: &buildman_and_testpy_dfn
   stage: test.py
+  retry: 2 # QEMU may be too slow, etc.
   before_script:
     # Clone uboot-test-hooks
     - git config --global --add safe.directory "${CI_PROJECT_DIR}"