Improve HTTP handling in scripts (#449)

Provide some helper methods to hide the complexity of parsing HTML, JSON, YAML, XML or Markdown.

src/apache-subversion.py

@@ -1,14 +1,12 @@
 import logging
 
-from bs4 import BeautifulSoup
 from common import dates, endoflife, http, releasedata
 
 for config in endoflife.list_configs_from_argv():
     with releasedata.ProductData(config.product) as product_data:
-        response = http.fetch_url(config.url)
-        soup = BeautifulSoup(response.text, features="html5lib")
+        html = http.fetch_html(config.url)
 
-        ul = soup.find("h2").find_next("ul")
+        ul = html.find("h2").find_next("ul")
         for li in ul.find_all("li"):
             text = li.get_text(strip=True)
             match = config.first_match(text)