Replace uses of map()

In Python 2, map() returns a list; in Python 3 it returns an iterator.

Replace all uses by list comprehensions, generators, or for loops,
as required.

Reviewed-By: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>

ipalib/frontend.py

@@ -870,7 +870,7 @@ class Command(HasParam):
             if optional and arg.required:
                 raise ValueError(
                     '%s: required argument after optional in %s arguments %s' % (arg.name,
-                    self.name, map(lambda x: x.param_spec, args()))
+                    self.name, [x.param_spec for x in args()])
                 )
             if multivalue:
                 raise ValueError(