Remove broxygen Sphinx integration

The broxygen-generated files now live in the git repo, have tests
that check that they are up-to-date, and a script to re-generate
them on-demand.

testing/scripts/gen-broxygen-docs.sh

@@ -0,0 +1,61 @@
+#! /usr/bin/env bash
+
+unset BRO_DISABLE_BROXYGEN
+
+# If running this from btest, unset any of the environment
+# variables that alter default script values.
+unset BRO_DEFAULT_LISTEN_ADDRESS
+unset BRO_DEFAULT_LISTEN_RETRY
+unset BRO_DEFAULT_CONNECT_RETRY
+
+dir="$( cd "$( dirname "$0" )" && pwd )"
+source_dir=$dir/../..
+build_dir=$source_dir/build
+conf_file=$build_dir/broxygen-test.conf
+output_dir=$source_dir/doc
+bro_error_file=$build_dir/broxygen-test-stderr.txt
+
+if [ -n "$1" ]; then
+    output_dir=$1
+fi
+
+case $output_dir in
+    /*) ;;
+    *) output_dir=`pwd`/$output_dir ;;
+esac
+
+cd $build_dir
+. bro-path-dev.sh
+export BRO_SEED_FILE=$source_dir/testing/btest/random.seed
+
+function run_bro
+    {
+    bro -X $conf_file broxygen >/dev/null 2>$bro_error_file
+
+    if [ $? -ne 0 ]; then
+        echo "Failed running bro with broxygen config file $conf_file"
+        echo "See stderr in $bro_error_file"
+        exit 1
+    fi
+    }
+
+scripts_output_dir=$output_dir/scripts
+rm -rf $scripts_output_dir
+printf "script\t*\t$scripts_output_dir/" > $conf_file
+echo "Generating $scripts_output_dir/"
+run_bro
+
+script_ref_dir=$output_dir/script-reference
+mkdir -p $script_ref_dir
+
+function generate_index
+    {
+    echo "Generating $script_ref_dir/$2"
+    printf "$1\t*\t$script_ref_dir/$2\n" > $conf_file
+    run_bro
+    }
+
+generate_index "script_index" "autogenerated-script-index.rst"
+generate_index "package_index" "autogenerated-package-index.rst"
+generate_index "file_analyzer" "autogenerated-file-analyzer-index.rst"
+generate_index "proto_analyzer" "autogenerated-protocol-analyzer-index.rst"