Create autopkgtest for redfang

It appears that redfang does not have any automated runtime tests, and is currently missing on autopkgtest.kali.org. As an effort to increase our coverage to allow for more automated package testing please could a non-superficial test (or more!) be created.

For more information on creating tests, can be found here Contributing run-time tests with autopkgtest, as well as on a example package guide.

This package is in our kali-linux-large metapackage.