Fix missing play assignment in a-o-i callback plugin

If a task fails in the quick installer it calls the
`v2_runner_on_failed` method in the callback plugin. I missed setting
`self._play` in the first iteration of the callback plugin, which it
turns out is critical for the `on_failed` method to work. This fixes
that by adding back in the assignment in the `play_start` method.

callback_plugins/openshift_quick_installer.py

@@ -1,4 +1,4 @@
-# pylint: disable=invalid-name,protected-access,import-error,line-too-long
+# pylint: disable=invalid-name,protected-access,import-error,line-too-long,attribute-defined-outside-init
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -112,6 +112,8 @@ role. Only the tasks directly assigned to a play are exposed in the
         else:
             msg = "PLAY [%s]" % name
 
+        self._play = play
+
         self.banner(msg)
 
     # pylint: disable=unused-argument,no-self-use