Fix to the apache version fo Ubuntu 13.10

The version.pp for Ubuntu 13.10 no longer works.

Apache 2.4 install no longer worked.

$distrelease is an integer and not decimal value
$::operatingsystemrelease mst be used

Also seems to break acceptance:
RS_SET=ubuntu-server-1310-x64 RS_DESTROY=onpass bundle exec rspec spec/acceptance/