only fix a minimum versoin for sysctl

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>
make compatible with sysctl 0.6.0

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>
improvement: extend support for chef-sysctl from 0.3.x-0.6.x

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>
Merge pull request #46 from TelekomLabs/sysctl-update

Sysctl update to 0.6.0