[Bugfix] Port ExecShield checks to RHEL7 and Fedora

- Enable for Fedora
- Fixes #59
The XSLT will automatically insert "If <OCIL clause>, then this is a finding." The word ````It```` should be lowercase here.

Instead of using ````it````, the feature should be specifically called out as ````ExecShield````. This would create OCIL as "If ExecShield is not supported by the hardware, is not enabled, or has been disabled by the kernel configuration, this is a finding"