Add dnf to the list of module that we squash loop items for

lib/ansible/runner/__init__.py

@@ -740,7 +740,7 @@ class Runner(object):
                 if type(items) != list:
                     raise errors.AnsibleError("lookup plugins have to return a list: %r" % items)
 
-                if len(items) and utils.is_list_of_strings(items) and self.module_name in [ 'apt', 'yum', 'pkgng', 'zypper' ]:
+                if len(items) and utils.is_list_of_strings(items) and self.module_name in ( 'apt', 'yum', 'pkgng', 'zypper', 'dnf' ):
                     # hack for apt, yum, and pkgng so that with_items maps back into a single module call
                     use_these_items = []
                     for x in items: