qemu: mkdir memory_backing_dir on startup
In 48d9e6cd and friends we've allowed users to back guest memory by a file inside the host. And in order to keep things manageable the memory_backing_dir variable was introduced to qemu.conf to specify the directory where the files are kept. However, libvirt's policy is that directories are created on domain startup if they don't exist. We've missed this one. Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
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