please consider supporting replace for bind:.server::file

[Zugschlus]

Hi,
for a server that will use nsupdate for zone file maintenance, it would be a nice idea to have puppet provide the initial content of the file but not overwrite it if it already exists. The replace attribute of the file resource is there to cater for this.
Please consider adding support for this attribute to the bind::server::file class.
I can submit an untested version of the probably trivial patch if you want me to.
Greetings
Marc