Squashed 'sysctl/' content from commit 92ad363

git-subtree-dir: sysctl
git-subtree-split: 92ad363e157ae8d5c807cbb618c5256f9e39feba
Add sysctl module
Add sysctl values_from_hash

Signed-off-by: Ben Agricola <bagricola@squiz.co.uk>