Add libtest-fatal-perl to Build-Depend

Fixing:

| 16:04:31    dh_auto_test
| 16:04:32 Can't locate Test/Fatal.pm in your Perl library.  You may need to install it
| 16:04:32 from CPAN or another repository.  Your library paths are:s

debian/control

@@ -25,6 +25,7 @@ Build-Depends: debhelper (>= 8),
                libsipwise-base-perl (>= 1.002),
                libstrictures-perl,
                libtemplate-plugin-xml-perl,
+               libtest-fatal-perl,
                libtest-xml-simple-perl,
                libthrowable-perl,
                libxml-libxml-simple-perl,