Setting query_cache_size to larger values might fail depending on the memory
pressure being put on the system. This can be seen on pushbuild as the test
case query_cache_size_basic tries to allocate a +3GB query cache, which
succeeds in some machines and fails in others.
So this part of the code where the test case tries to allocate +3GB query cache has been
disabled for now to get the test running on pb2.
04b1eeb195