Merge ~pwlars/testflinger-cli:unbuffer-poll-only into testflinger-cli:master

[Paul Larson]

python -u was causing some problems, and it looks like re-opening sys.stdout doesn't work well with python3. However, I think we are really only concerned about making sure we don't buffer output when running with poll. That way Jenkins jobs and things like that don't get buffered in the output stream from this.

[Maciej Kisielewski (kissiel)]

awesome sauce

review: Approve

diff --git a/testflinger-cli b/testflinger-cli
index 126332e..b0e8f0e 100755
--- a/testflinger-cli
+++ b/testflinger-cli
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3 -u
+#!/usr/bin/env python3
 # Copyright (C) 2017 Canonical
 #
 # This program is free software: you can redistribute it and/or modify
@@ -143,7 +143,7 @@ def poll(ctx, job_id):
                 # We are still waiting for the job to start
                 pass
         if output:
-            print(output, end='')
+            print(output, end='', flush=True)
         job_state = conn.get_status(job_id)
         if job_state == 'complete':
             break