which control three things:
1. should we initialize?
2. if so, how?
3. what environment variables and user to use
The approach taken is very similar to what the Apache formula uses, namely:
a default dictionary which is over-ridden by:
os-specific defaults,
then os codename defaults,
then os finger defaults,
and finally user-specified pillar values
- this also adds support for grains['osfinger']
