Request: rndc function to print zone content over rndc channel

Sometimes for scripting and debugging purposes it would be helpful to be able to obtain the content of a zone via "rndc" (in cases where zone transfer is restricted or turned off)

example:

$ rndc printzone example.com
example.com.   3600 IN SOA ns1.example.com. ...
example.com.   3600 IN NS ns1.example.com.
[...]