Log exception when doing a remote execution.

ccnode/host/__init__.py

@@ -52,8 +52,12 @@ class Handler(BasePlugin):
         :param string command: shell command to run
         """
         # return stdout and stderr mixed in
+        try:
             return Popen(command, shell=True, bufsize=-1, stdin=PIPE, stdout=PIPE,
                          stderr=STDOUT).communicate()[0] or None
+        except Exception:
+            logger.exception('Error while executing a remote command')
+            raise
 
     def node_shutdown(self, reboot=True, gracefull=True):
         """Halt/Reboot the node.