[Libguestfs] Generator functions format changed slightly

[Richard W.M. Jones]

https://github.com/libguestfs/libguestfs/commit/39d1a7dbc9c7d4ae8cbb492a39149d1f8e75ff70
[for some reason, github hides most of that commit]

This commit changes the format of the generator functions
slightly.  The commit message contains an example, and it
should be straightforward to convert between the two formats.

The new format is documented in generator/generator_types.ml.

The reason for changing this is so that we can attach other
data to each function.

Rich.

-- 
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