Reduce the number of redundant host blocking warnings by not

retrying the same previously-blocked URLs.

--HG--
branch : setuptools
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/trunk/setuptools%4041395

setuptools/package_index.py

@@ -163,6 +163,7 @@ class PackageIndex(Environment):
             return  # don't need the actual page
 
         if not self.url_ok(url):
+            self.fetched_urls[url] = True
             return
 
         self.info("Reading %s", url)
@@ -202,7 +203,6 @@ class PackageIndex(Environment):
 
 
 
-
     def process_index(self,url,page):
         """Process the contents of a PyPI page"""