sysprep: remove more anaconda and tuned logs (RHBZ#1039540).
launch: switch from -nographic to -display none

The latter is a better way to disable the qemu display output as we
need to, without enabling extra devices (which are disabled already,
anyway).

Also, related to the change above, ban the -display parameter from the
ones that can be supplied by the user.
sysprep: allow to specify globbing for --delete

Adapt the globbing part from the old --remote-path work previously
proposed for sysprep [1], allowing --delete to perform globbing when
deleting paths.

[1] https://www.redhat.com/archives/libguestfs/2013-October/msg00045.html