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/aci.py

@@ -103,8 +103,6 @@ class ACI(object):
         lexer = shlex.shlex(aci)
         lexer.wordchars = lexer.wordchars + "."
 
-        l = []
-
         var = False
         op = "="
         for token in lexer: