networkd-dispatcher: remove unused configparser, use installManPage and --replace-fail

pkgs/by-name/ne/networkd-dispatcher/package.nix

···
   stdenv,
   fetchFromGitLab,
   fetchpatch,
+  installShellFiles,
   python3Packages,
   asciidoc,
   wrapGAppsNoGuiHook,
···
   postPatch = ''
     # Fix paths in systemd unit file
     substituteInPlace networkd-dispatcher.service \
-      --replace "/usr/bin/networkd-dispatcher" "$out/bin/networkd-dispatcher"
+      --replace-fail "/usr/bin/networkd-dispatcher" "$out/bin/networkd-dispatcher"
     # Remove conditions on existing rules path
     sed -i '/ConditionPathExistsGlob/g' networkd-dispatcher.service
   '';
 
   nativeBuildInputs = [
-    asciidoc
+    asciidoc # for a2x
+    installShellFiles
     wrapGAppsNoGuiHook
     python3Packages.wrapPython
   ];
···
   ];
 
   pythonPath = with python3Packages; [
-    configparser
     dbus-python
     pygobject3
   ];
···
     install -D -m755 -t $out/bin networkd-dispatcher
     install -Dm644 networkd-dispatcher.service $out/lib/systemd/system/networkd-dispatcher.service
     install -Dm644 networkd-dispatcher.conf $out/etc/conf.d/networkd-dispatcher.conf
-    install -D networkd-dispatcher.8 -t $out/share/man/man8/
+    installManPage networkd-dispatcher.8
     runHook postInstall
   '';