[transport] Prevent package list for unresponsive nodes

Raise error when _connect() returns non zero status.

Signed-off-by: Trevor Benson <trevor.benson@gmail.com>

sos/collector/transports/saltstack.py

@@ -106,6 +106,8 @@ def _connect(self, password=None):
         self.log_info("Transport is locally supported and service running. ")
         cmd = "echo Connected"
         result = self.run_command(cmd, timeout=180)
+        if result['status'] == 1:
+            raise ConnectionException(self.address)
         return result['status'] == 0
 
     def _disconnect(self):