Added all items from CIS Section 7 Levels 1 & 2

https://benchmarks.cisecurity.org/tools2/ubuntu/CIS_Ubuntu_12.04_LTS_Server_Benchmark_v1.0.0.pdf
There's an additional kernel param that doesn't have a matching `sysctl` step - think we need to do anything with it?

`# /sbin/sysctl -w net.ipv4.route.flush=1`