move misc source file test and fix scripts to xt/

The license and non-UTF8 file checks are closer to
author tests and don't really belong at the top level of the
Koha source tree.  Follow-up might be to converted them
to test cases in xt/author that can be run by prove(1).

Signed-off-by: Galen Charlton <gmcharlt@gmail.com>

xt/fix-old-fsf-address

@@ -4,9 +4,9 @@
 # instead of the Franklin Street one. Files to be fixed are read from
 # stdin. Typical usage would be:
 #
-#   ./find-license-problems . | 
-#   grep -vFx -f fix-old-fsf-address.exclude | 
-#   ./fix-old-fsf-address
+#   ./xt/find-license-problems . | 
+#   grep -vFx -f ./xt/fix-old-fsf-address.exclude | 
+#   ./xt/fix-old-fsf-address
 #
 # Copyright 2010 Catalyst IT Ltd
 #