Reduce the likihood of a lingering /var/run/com.googlecode.munki.ManagedSoftwareUpdate by sleeping for 1/2 a second (instead of .1) and using open() instead of subprocess+touch to write the file.

code/client/managedsoftwareupdate

@@ -354,9 +354,9 @@ def notifyUserOfUpdates(force=False):
         # notify user of available updates using LaunchAgent to start
         # Managed Software Update.app in the user context.
         launchfile = '/var/run/com.googlecode.munki.ManagedSoftwareUpdate'
-        cmd = ['/usr/bin/touch', launchfile]
-        unused_retcode = subprocess.call(cmd)
-        time.sleep(1)
+        f = open(launchfile, 'w')
+        f.close()
+        time.sleep(0.5)
         if os.path.exists(launchfile):
             os.unlink(launchfile)
         user_was_notified = True