Sync sysctl module to v0.0.4 from upstream

v0.0.4 sha1: 3b027e816818f2c1086075038ac9b4af1cadbc24
Implements: blueprint merge-openstack-puppet-modules

Change-Id: I37044643fb8338001493af4ee94cdd6e3648b40d
Merge "Sync sysctl module to v0.0.4 from upstream"