Merged in distributed_not_closing_well (pull request #10)

[NRRPLT-0000] Distributed not killing the subprocess

Approved-by: Eloy Retamino <retamino@ugr.es>
Approved-by: Hossain Mahmud <hossain.mahmud@gmail.com>

hbp_nrp_distributed_nest/hbp_nrp_distributed_nest/launch/MPILauncher.py

@@ -179,7 +179,8 @@ class MPILauncher(object):
     def _any_child_status(self, status):
         try:
             parent = psutil.Process(self._process.pid)
-            return any([
+            children = parent.children(recursive=True)
+            return not children or any([
                 child.status() in status
                 for child in parent.children(recursive=True)
             ])
@@ -220,7 +221,6 @@ class MPILauncher(object):
 
         while not self._any_child_status([psutil.STATUS_STOPPED, psutil.STATUS_ZOMBIE]):
             time.sleep(2)
-
         self._kill_children()
 
         if self._any_child_status([psutil.STATUS_SLEEPING, psutil.STATUS_RUNNING]):