Allow conditional imports, see examples/playbook3.yml comments for a full explanation. Extensive

refactoring of playbooks now warranted, which we'll do before we move on.   This variable assignment
system makes nearly all possible magic possible, for we can use these variables however we like,
even as module names!

bin/ansible-playbook

@@ -52,6 +52,15 @@ class PlaybookCallbacks(object):
     def on_ok(self, host, host_result):
         print "ok: [%s]\n" % (host)
 
+    def on_setup_primary(self):
+        print "preparing nodes..."
+
+    def on_setup_secondary(self):
+        print "preparing conditional imports..."
+
+    def on_import_for_host(self, host, imported_file):
+        pass
+
     def on_play_start(self, pattern):
         print "PLAY [%s] ****************************\n" % pattern