Use address sanitizer to catch use-after-free and other errors when
running the test suite.
Leak detection is disabled, because currently there are too many leaks,
making almost all tests fail otherwise.
The atexit=1 is for verifying that ASan was actually used.
The default 128 MB of RAM in the qemu machine leads to oom-killer
killing most tests, so bump the memory size to 1 GB.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>