Do not use relative paths for scripts

Currently, in a number of places, we run . maint/bash-utils.sh or the equivalent.

We need to replace this with some kind of absolute path solution. Or force them to be CI only. Or something.

18:42 <+nickm> Maybe we can find a better alternative.  This might be my 1990s 
               experiences talking but I'm really uncomfortable with scripts 
               that can do arbitrary code exec if you run them from the wrong 
               CWD.