Added all CIS Section 8 Level 1 & 2 tasks & various fixes

https://benchmarks.cisecurity.org/tools2/ubuntu/CIS_Ubuntu_12.04_LTS_Server_Benchmark_v1.0.0.pdf
This regexp is a little over my head - but I'm trying to figure out if this somehow takes cares of both parts of `8.1.3`:

* `/boot/grub/grub.cfg`: Make sure each line that starts with linux has the audit=1 parameter set.
* `/etc/default/grub`: Edit /etc/default/grub to include audit=1 as part of GRUB_CMDLINE_LINUX

To me it looks like a mix of both.