cri-o: install cni and crictl files

pkgs/applications/virtualization/cri-o/default.nix

···
       installShellCompletion --$shell completions/$shell/*
     done
 
+    install contrib/cni/*.conf -Dt $out/etc/cni/net.d
+    install crictl.yaml -Dt $out/etc
+
     installManPage docs/*.[1-9]
     runHook postInstall
   '';

pkgs/applications/virtualization/cri-o/wrapper.nix

···
   ln -s ${cri-o-unwrapped.man} $man
 
   mkdir -p $out/bin
+  ln -s ${cri-o-unwrapped}/etc $out/etc
   ln -s ${cri-o-unwrapped}/share $out/share
 
   for p in ${cri-o-unwrapped}/bin/*; do