[Libguestfs] [PATCH] sysprep: Enable the network, add --no-network to disable it

[Richard W.M. Jones]

This is just one possible way to fix this bug, but the simplest.

Others I considered:

 - Keeping the network disabled by default.  Options like --install
   wouldn't work and there would be no actionable error message
   telling users what to do to fix it.

 - Modifying virt-customize to warn/error/suggest if operations like
   --install were used but the network was disabled.  However it's not
   always wrong to use --install + --no-network, so getting the right
   message is difficult.

 - Disabling any customize operations that are not relevant to
   virt-sysprep.  I think this is unnecessarily harsh.

Rich.