virtio_fs_nfs_migration: Virtiofs migration testing over NFS #7036

Job	Run time
Cfg lint	13s
PR title	1s
Python 3.6	1m 13s
Commit lint	16s
Python 3.9	1m 36s
Cartesian syntax (qemu/tests/cfg/virtio_fs_nfs_migration.cfg)	7s
	3m 26s

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