Add support of /etc/sysctl.d/*.conf in the sysctl parameter check template for RHEL 6
Add a template of sysctl parameter checks for RHEL 7, based on the one for RHEL 6
Merge pull request #45 from ssato/sysctl.d-support

Add support of /etc/sysctl.d/*.conf in the sysctl parameter check template for RHEL6