Tests: fail automated tests on memory leaks and other internal errors

This adds a new `--debug-exit-on-error` flag. When it is set, Blender
will abort with a non-zero exit code when there are internal errors.
Currently, "internal errors" includes memory leaks detected by
guardedalloc and error/fatal log entries in clog.

The new flag is passed to Blender in various places where automated
tests are run. Furthermore, the `--debug-memory` flag is used in tests,
because that makes the verbose output more useful, when dealing
with memory leaks.

Reviewers: brecht, sergey

Differential Revision: https://developer.blender.org/D8665

tests/python/cycles_render_tests.py

@@ -20,6 +20,8 @@ def get_arguments(filepath, output_filepath):
         "-noaudio",
         "--factory-startup",
         "--enable-autoexec",
+        "--debug-memory",
+        "--debug-exit-on-error",
         filepath,
         "-E", "CYCLES",
         "-o", output_filepath,