bin/stack should alphabetize methods and controllers

[termie]

currently they come back in arbitrary order

root@maverick:~/nova # ./bin/stack
usage: stack [options] <controller> <method> [arg1=value arg2=value]

--SNIP--

Available controllers:
   reflect Reflection methods to list available methods.
   compute API for interacting with the compute manager.

[Thierry Carrez (ttx)]

@termie: are you working on that ? If not, maybe unassign yourself so that someone else would feel free to take it.