Kafo

Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1218792
Description of problem:
When there is more installer hooks in one category (e.g. 'pre-validation') Kafo is supposed to execute them in alphabetical order. That does not happen on Ruby 1.8 and the order is unpredictable.

Version-Release number of selected component (if applicable):

How reproducible:
Sometimes

Steps to Reproduce:
1. add hooks to one hook category that are just logging something
2. run installer multiple times on system with ruby 1.8
3. the order in log differs

Actual results:

Expected results:
The hooks are executed in alphabetical order

Additional info:
AFAIK we do not have hooks that depend on the order in Sat 6, I hit this issue while adding hooks for RHCI