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Add a "GetVersion" upcall to allow nfsd to determine the maximum upcall version that the nfsdcld userspace daemon supports. If the daemon responds with -EOPNOTSUPP, then we know it only supports v1. Signed-off-by: Scott Mayhew <smayhew@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>