Conditional Imports should only import the first file in the list, not all of…

Conditional Imports should only import the first file in the list, not all of them. This change stops looping through the vars_files list as soon as a file is found.

lib/ansible/playbook/play.py

@@ -232,6 +232,8 @@ class Play(object):
                             self.vars.update(data)
                     elif host is not None:
                         self.playbook.callbacks.on_not_import_for_host(host, filename4)
+                    if found
+                        break
                 if not found:
                     raise errors.AnsibleError(
                         "%s: FATAL, no files matched for vars_files import sequence: %s" % (host, sequence)