Explicitly exclude urls with .. in search crawling

There were per-site configured rules defined but the regexp was slightly
incorrectly defined. However, we should just simply never crawl urls
like this unless they are normalized, so for now just add them to the
hardcoded exclusion rules.

tools/search/crawler/lib/genericsite.py

@@ -31,6 +31,8 @@ class GenericSiteCrawler(BaseSiteCrawler):
 			self.queue.put((x, 0.5, False))
 
 	def exclude_url(self, url):
+		if ".." in url:
+			return True
 		if self.robots and self.robots.block_url(url):
 			return True
 		for r in self.extra_excludes: