Make heat container remove silent.

This was being called multiple times and causing an error msg.  This just
ensures cleanup so we don't need to know if it failed.

Change-Id: I6ae122b60274b77758b6c633904b55e2e0d74bed

tripleoclient/heat_launcher.py

@@ -170,7 +170,8 @@ class HeatDockerLauncher(HeatBaseLauncher):
     def kill_heat(self, pid):
         cmd = ['docker', 'rm', '-f', 'heat_all']
         log.debug(' '.join(cmd))
-        subprocess.check_call(cmd)
+        # We don't want to hear from this command..
+        subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 
 
 class HeatNativeLauncher(HeatBaseLauncher):