Merge pull request #1347 from Bastian-Krause/bst/ssh-stdin

driver/sshdriver: redirect /dev/null to stdin in run()

labgrid/driver/sshdriver.py

@@ -214,7 +214,7 @@ def _run(self, cmd, codec="utf-8", decodeerrors="strict", timeout=None):
             stderr_pipe = subprocess.PIPE
         try:
             sub = subprocess.Popen(
-                complete_cmd, stdout=subprocess.PIPE, stderr=stderr_pipe
+                complete_cmd, stdin=subprocess.DEVNULL, stdout=subprocess.PIPE, stderr=stderr_pipe
             )
         except:
             raise ExecutionError(