AVCs with unknown target path were described eg. as follows:

SELinux is preventing /usr/bin/dmesg from syslog_read access on the
system Unknown.

* Plugin catchall (100. confidence) suggests

If you believe that dmesg should be allowed syslog_read access on the
Unknown system by default.

Replace the confusing descriptions by:

SELinux is preventing /usr/bin/dmesg from syslog_read access on the
system labeled system_label_t.

* Plugin catchall (100. confidence) suggests

If you believe that dmesg should be allowed syslog_read access on the
system labeled system_label_t by default.

The requirement for 3-tuple (catchall.py: 53) guarantees backwards
compatibility with AVCs that are already in the setroubleshoot database.

Resolves: rhbz#1437772