Add hba & servers settings control

[suquant]

FYI

[epcim]

we don't do it this way for a good reason. Rather structure the settings under postresql:server pillar directly. That will make pillars readable, structured etc. The formula user should not recognize whether it's value for config file, etc..

I personally would agree with kind of "generic" ad-hoc way to add additional settings that formula don't support, but as we don't have any described procedure for that, it will not pass other reviewers.

[epcim]

please omit the settings, branch and move all things one level up.