Debian: add script_dir into example.cfg. add directory for scripts

debian/etc/example.cfg

@@ -26,6 +26,12 @@ file_descriptors = 8192
 #
 admin_port = 33015
 
+#
+# directory that contains lua procedures
+# (the first script must have name 'init.lua')
+#
+script_dir = /usr/share/tarantool/lua/
+
 #
 # Each write ahead log contains this many rows.
 # When the limit is reached, Tarantool closes

debian/tarantool.dirs

+/usr/share/tarantool/lua