Add support for cmocka assert testing by overriding REQUIRE/INSIST/... macros...

Add support for cmocka assert testing by overriding REQUIRE/INSIST/... macros when UNIT_TESTING is defined

(cherry picked from commit 52731c00)
18 jobs for 250-integrate-cmocka-into-our-build-scripts-v9_11 in 13 minutes and 2 seconds (queued for 5 seconds)