virtio_fs_localfs_migration: Migrate localfs with different cache modes #7483

Job	Run time
PR title	1s
Cfg lint	9s
Python 3.6	1m 21s
Commit lint	18s
Python 3.9	1m 35s
Cartesian syntax (qemu/tests/cfg/virtio_fs_localfs_migration.cfg)	6s
	3m 30s

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