Increase disk_size from 10GB to 80GB to match files.vagrantup.com boxes

The vagrant boxes provided by files.vagrantup.com have dynamic disks sized to 80GB.

These boxes instead are only 10 GB. This makes using the boxes for testing and developing larger sites with many files difficult.

I basically just ran `sed -i "s/:disk_size => '10140'/:disk_size => '81920'/" definitions/*/definition.rb` on the files, and manually changed the sles definitions to match.

It'd be nice if all the definitions were laid out the same, but that's for another commit.