avoid buffering stdout output on pipes (bnc#930137)

https://bugzilla.opensuse.org/show_bug.cgi?id=930137

osc-wrapper.py

@@ -5,6 +5,7 @@
 
 import locale
 import sys
+import os
 
 from osc import commandline, babysitter
 
@@ -21,6 +22,10 @@ except NameError:
     #reload, neither setdefaultencoding are in python3
     pass
 
+# avoid buffering output on pipes (bnc#930137)
+if sys.stdout.name == '<stdout>':
+    sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
+
 osccli = commandline.Osc()
 
 r = babysitter.run(osccli)