Adding ability to read/write Permission Configs and cli to access them

- Added the ability to set/list/remove permission configurations from prefixes.
- Most of this was a mimic of what Spencer wrote for the zone configurations.
- Also consolidated some of the repeated code where I could.

Once this is merged, I'll create a similar treatment for Accounting Configurations.
I've been in c#/java/javascript land for too long.  Where abbreviations are frowned upon.  I'll change them all to perms.  I do like the idea of calling them acl, but I'd rather it matches the proto name.