Fixes #3141: Finished the SUID/SGID compliant version of the filePermissions PT/Technique
Refs #3141: fix class usage and cleanup
Refs #3141: only use the protective class when necessary
Merge pull request #39 from jooooooon/ust_3115/dev/3141_suid_sgid_handling_in_file_permissions_technique_JCL

Ust 3115/dev/3141 suid sgid handling in file permissions technique jcl