NFSv4/pnfs: key the data server cache on the NFS version

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                        "fs/nfs/filelayout/filelayoutdev.c",
                        "fs/nfs/flexfilelayout/flexfilelayoutdev.c",
                        "fs/nfs/pnfs.h",
                        "fs/nfs/pnfs_nfs.c"
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/nfs/filelayout/filelayoutdev.c",
                        "fs/nfs/flexfilelayout/flexfilelayoutdev.c",
                        "fs/nfs/pnfs.h",
                        "fs/nfs/pnfs_nfs.c"
                    ],
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                }