delete lvm groups in kickstart

[Farkas Levente]

hi,
in kickstart one can use clearpart to remove old partition, but there is
no command to remove old lvm volgroup or logvols. and if there are
volgroup or logvols already on the system where you want to install
through kickstart the install process failed with a python stack trace
since eg. VolGroup00 already exist and can't be created.
currently there is no other way to delete only in %pre scripts but imho
it'd be an essential feature.
yours.

-- 
  Levente                               "Si vis pacem para bellum!"