Read restrict option

[albertomn86]

This PR fixes the issue #1860

...
        "directories": [
            {
               "recursion_level": 256,
               "restrict": "txt$",
               "dir": "/etc",
               "opts": [
                  "check_md5sum",
                  "check_sha1sum",
                  "check_perm",
                  "check_size",
                  "check_owner",
                  "check_group",
                  "check_mtime",
                  "check_inode",
                  "check_sha256sum",
                  "check_whodata"
               ]
            },
...