@sample surprises (dns/knot-resolver)

[Adriaan de Groot]

As prep-work for CMake updates I locally "exp-run" all the ports that use 
CMake. I use poudriere for this, with the `-t` flag to test each port.

dns/knot-resolver fails to package like that, with this error:

=======================<phase: package        >============================
===>  Building package for knot-resolver-5.3.0
@sample with 1 single argument expect ".sample" extension
pkg-static: Fail to apply keyword 'sample'
*** Error code 1


The same failure occurs on the build cluster. I checked the porter's handbook 
and it describes 1- and 2-argument forms of @sample, but neither seemed 
applicable here without digging into the port itself to rename the installed 
configuration file. What's the right approach here?

(CC'ed maintainer and last committer; I'm going to locally stop building this 
one in preparation of a CMake update)
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