Remove unused variables in the code

This commit removes unused variables or rename variables as "expected to
be unused" by using "_" prefix.

This covers only cases where fix was easy or only one unused variable
was in a module

Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>
Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>

ipalib/cli.py

@@ -1342,7 +1342,7 @@ cli_plugins = (
 def run(api):
     error = None
     try:
-        (options, argv) = api.bootstrap_with_global_options(context='cli')
+        (_options, argv) = api.bootstrap_with_global_options(context='cli')
         for klass in cli_plugins:
             api.add_plugin(klass)
         api.finalize()