qa/tasks/vstart_runner: make remote.sh return str as default

To address the issue in https://github.com/ceph/teuthology/pull/1459.

Signed-off-by: Xiubo Li <xiubli@redhat.com>

diff --git a/qa/tasks/vstart_runner.py b/qa/tasks/vstart_runner.py
index fb5dfb0e9c070687852667423ae7a102696bc5a2..d6a69066255e6e3b0654591e66316ec0c46aae0d 100644 (file)
--- a/qa/tasks/vstart_runner.py
+++ b/qa/tasks/vstart_runner.py
@@ -417,7 +417,7 @@ class LocalRemote(object):
             remote_date = remote.sh('date')
         """
         if 'stdout' not in kwargs:
-            kwargs['stdout'] = BytesIO()
+            kwargs['stdout'] = StringIO()
         if 'args' not in kwargs:
             kwargs['args'] = script
         proc = self.run(**kwargs)