testing{-python}.nix: Remove log pretty-printing cruft

This completes the removal of the nested log feature, which previously
got removed from Nix, Hydra, stdenv and GNU Make. In particular, this
means that the output of VM builds no longer contains a copy of
jQuery.

nixos/lib/testing-python.nix

@@ -62,25 +62,11 @@ in rec {
 
       requiredSystemFeatures = [ "kvm" "nixos-test" ];
 
-      buildInputs = [ libxslt ];
-
       buildCommand =
         ''
-          mkdir -p $out/nix-support
+          mkdir -p $out
 
-          LOGFILE=$out/log.xml tests='exec(os.environ["testScript"])' ${driver}/bin/nixos-test-driver
-
-          # Generate a pretty-printed log.
-          xsltproc --output $out/log.html ${./test-driver/log2html.xsl} $out/log.xml
-          ln -s ${./test-driver/logfile.css} $out/logfile.css
-          ln -s ${./test-driver/treebits.js} $out/treebits.js
-          ln -s ${jquery}/js/jquery.min.js $out/
-          ln -s ${jquery}/js/jquery.js $out/
-          ln -s ${jquery-ui}/js/jquery-ui.min.js $out/
-          ln -s ${jquery-ui}/js/jquery-ui.js $out/
-
-          touch $out/nix-support/hydra-build-products
-          echo "report testlog $out log.html" >> $out/nix-support/hydra-build-products
+          LOGFILE=/dev/null tests='exec(os.environ["testScript"])' ${driver}/bin/nixos-test-driver
 
           for i in */xchg/coverage-data; do
             mkdir -p $out/coverage-data