prerequisites: fix for Ubuntu 14.04 LTS

* switching from openoffice.org to libreoffice

* disabling 000-default as well as default-ssl using wildcard.

* renaming vhost configuration to .conf otherwise a2ensite doesn't see
  them.

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>
invenio-kickstart: fix devscript path

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>