Add enable_certificate_validation config option

This patch adds enable_certificate_validation config option. This option
can be used to skip tests that rely on image signature certificate
validation being enabled on the test environment
(test_signed_image_invalid_cert_boot_failure).

Related-PRODX: PRODX-35048
Change-Id: Id4134a2e87378487baa9e3d5f49e7ded48daa765
(cherry picked from commit ec5f58ab8f5ace2890aa11e5c30a37efe753aa84)
2 files changed