new remediation - CCE-26910-0 - world writable files

imported remediation script from RHEL6 STIG fix
This remediation doesn't completely match the rule expectations. The current XCCDF & OVAL checks there are no world writeable files present on the system. While the remediation checks just the control scripts (/etc/rc.*, /etc/init.d ...) - select file paths they reference & ensures these referenced scripts does not have world writeable permission set.

So either:
* we need to modify also XCCDF & OVAL to read the rule is checking that each control script does not reference some file, which would be world writeable,

or we keep current XCCDF & OVAL as is (IOW to say / require there isn't a world-writable file present on the system), and modify the remediation (not to check just file paths referenced from control scripts not to be world writable, but to check all files on the system).

Example: The proposed remediation won't work for e.g:
```
touch /tmp/word_writable
chmod 777 /tmp/world_writable
```
The OVAL check will fail before & after the remediation. The question is what the rule is trying to require / enforce:
* if there shouldn't be world-writable files on the system, or
* if there shouldn't be control script, referencing some world-writable file, present on the system.

It's similar, but slightly different requirement (current XCCDF suggests to check any file on the system via find command). Once the rule requirement is clear, we can decide if this remediation is correct or not (right now it's mixing two different PoVs).