[Pdns-users] pipe-abi-version

[Patrick Domack]

I was updating my pipe backend and notice there are now abi levels.  
Updated my script to handle abi level 3, and then noticed powerdns  
failed to start due to known config option pipe-abi-version.

https://doc.powerdns.com/md/authoritative/backend-pipe/#pipebackend-protocol

I am running powerdns 4.0.3

a search of the source code doesn't prove anything more useful.

./docs/markdown/authoritative/backend-pipe.md:## `pipe-abi-version`
./docs/markdown/authoritative/backend-pipe.md:If not set the default  
`pipe-abi-version` is 1.
./docs/markdown/authoritative/backend-pipe.md:### pipe-abi-version = 1  
[default]
./docs/markdown/authoritative/backend-pipe.md:### pipe-abi-version = 2
./docs/markdown/authoritative/backend-pipe.md:### pipe-abi-version = 3