[ci] Continue building remaining dtests on failure

Change-Id: Iab7fd53517e0b66dd5f71efb9e65bd2e9c91355b

Jenkinsfile

@@ -118,7 +118,7 @@ def docker_build_inside_image( def build_image, String inside_args, String platf
             set -x
             cd ${build_dir_rel}
             make install -j\$(nproc)
-            make build_tests -j\$(nproc)
+            make build_tests -i -j\$(nproc)
             make test 
           """
         // If unit tests output a junit or xunit file in the future, jenkins can parse that file