ovn: split out lib, man, dev, and tools

This drastically reduces the size of the main service closure, mainly
because python is no longer in it (used for auxiliary client side
debug tools).

For static build, closure size went 387.7M -> 115.0M.

pkgs/by-name/ov/ovn/package.nix

@@ -32,6 +32,14 @@ stdenv.mkDerivation (finalAttrs: {
     fetchSubmodules = true;
   };
 
+  outputs = [
+    "out"
+    "lib"
+    "man"
+    "dev"
+    "tools"
+  ];
+
   patches = [
     # Fix test failure with musl libc.
     (fetchpatch {
@@ -91,6 +99,15 @@ stdenv.mkDerivation (finalAttrs: {
   ];
 
   postInstall = ''
+    moveToOutput 'share/ovn/bugtool-plugins' "$tools"
+    moveToOutput 'share/ovn/scripts/ovn-bugtool-*' "$tools"
+
+    moveToOutput 'bin/ovn-detrace' "$tools"
+    moveToOutput 'bin/ovn_detrace*' "$tools"
+    moveToOutput 'bin/ovn-trace' "$tools"
+    moveToOutput 'bin/ovn-debug' "$tools"
+    moveToOutput 'bin/ovn-docker*' "$tools"
+
     sed -i '/chown -R $INSTALL_USER:$INSTALL_GROUP $ovn_etcdir/d' $out/share/ovn/scripts/ovn-ctl
 
     mkdir -vp $out/share/openvswitch/scripts