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']
There should be a better way of doing this, as I'm hardcoding the version name into the config dir.
On Debian based systems, postgresql is configured in "clusters" using some Debian specific tools. The main cluster is called ... main, which is why the `conf_dir` has a suffix of `main`.
