[Libguestfs] [PATCH v3 RESEND] direct, fish: add blocksize as optional argument for launch command

[Richard W.M. Jones]

Blocksize is a property of a disk, not the handle or launch
command.  So:

(1) Add a blocksize parameter to add_drive:

https://github.com/libguestfs/libguestfs/blob/696b1b059a05f78fb2c55c50bcfee651a2c5ead9/generator/actions_core.ml#L213

(2) (Optional, if still needed after doing step 1).  Add a --blocksize
parameter to guestfish and the virt-* tools which work like the
--format parameter.  See ‘OPTION_format’ throughout the code.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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