[Libguestfs] [PATCH v8] v2v: Add -o rhv-upload output mode (RHBZ#1557273).

[Richard W.M. Jones]

v7 was here:
https://www.redhat.com/archives/libguestfs/2018-March/msg00143.html

Since then:

 - Earlier patches are now upstream.

 - The to-do list is moved from the commit message to the TODO file.

 - This version forces -of raw + -oa sparse and gives an error in
   any other mode.  We intend to lift these restrictions later.

 - Tested against latest imageio which supports longer timeouts,
   zero, flush (but not trim),

Rich.