drop PyOpenSSL usage

We've replaced it with requests library some time ago, this code has no
better sensitivity than requests error checking, so we can drop it
completely.

Fixes: https://pagure.io/koji/issue/2752

www/lib/kojiweb/util.py

@@ -36,17 +36,6 @@ import koji
 import koji.tasks
 
 
-class NoSuchException(Exception):
-    pass
-
-
-try:
-    # pyOpenSSL might not be around
-    from OpenSSL.SSL import Error as SSL_Error
-except Exception:
-    SSL_Error = NoSuchException
-
-
 themeInfo = {}
 themeCache = {}