[PATCH 4/5] lnst.Controller.Controller: implement wait method

From: Ondrej Lichtner <olichtne(a)redhat.com&gt;

The wait method implements the old "wait for x seconds" functionality
we've had in the old LNST. The method is exported to the tester/recipe
throught the Controller class and uses the newly implemented
wait_for_condition MessageDispatched method.

This implementation is an improvement compared to the older
functionality as the Controller is still receiving and processing
messages from slaves so conditions can wait for a specific update to the
state of a slave and logging will still work during while we're waiting.

Signed-off-by: Ondrej Lichtner <olichtne(a)redhat.com&gt;
---
 lnst/Controller/Controller.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/lnst/Controller/Controller.py b/lnst/Controller/Controller.py
index 3415f63..0d30026 100644
--- a/lnst/Controller/Controller.py
+++ b/lnst/Controller/Controller.py
@@ -14,6 +14,7 @@ olichtne(a)redhat.com (Ondrej Lichtner)
 
 import os
 import sys
+import time
 import datetime
 import logging
 from lnst.Common.Logs import LoggingCtl, log_exc_traceback
@@ -128,6 +129,17 @@ class Controller(object):
             finally:
                 self._cleanup_slaves()
 
+    def wait(self, sec):
+        finish_time = time.time() + sec
+        logging.info("Suspending recipe execution for {} seconds, "
+                     "messages from slaves will still be processed.".
+                     format(sec))
+
+        def condition():
+            return time.time() > finish_time
+
+        self._msg_dispatcher.wait_for_condition(condition)
+
     def _map_match(self, match, requested):
         self._machines = {}
         self._hosts = Hosts()
-- 
2.15.1