Fix errors found by Pylint-2.4.3

New Pylint (2.4.3) catches several new 'true problems'. At the same
time, it warns about things that are massively and reasonably
employed in FreeIPA.

list of fixed:
- no-else-continue
- redeclared-assigned-name
- no-else-break
- unnecessary-comprehension
- using-constant-test (false positive)

list of ignored (responsibility of contributors and reviewers):
- import-outside-toplevel

Fixes: https://pagure.io/freeipa/issue/8102
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Fraser Tweedale <ftweedal@redhat.com>

ipatests/test_xmlrpc/test_certmap_plugin.py

@@ -206,7 +206,7 @@ def certmap_user(request):
 
 def addcertmap_id(options):
     if options:
-        return u', '.join([k for k in options])
+        return u', '.join(list(options))
     else:
         return u' '