Add OVAL check for Ctrl_Alt_Delete

- Adds OVAl check to check that Ctrl+Alt+Delete is disabled
Update disable_ctrlaltdel_reboot.xml
Merge remote branch 'origin/master' into add_ctrl_alt_delete_oval
Update disable_ctrlaltdel_reboot.xml

- Update for upstart-0.6.5-12.el6 AND HIGHER
Update disable_ctrlaltdel_reboot.xml

Update pattern check to ignore comments after 'now'
Merge pull request #31 from redhatrises/add_ctrl_alt_delete_oval

Add OVAL for CTRL-ALT-DELETE key sequence