Add exception handling for OSError that my be thrown by os.fsync

We've seen instances where "Bad file descriptor" OSError was raised.
This looks similar to 52d69be.
Handle in the same way by ignoring the error and continuing execution.

Signed-off-by: Sebastian Mitterle <[email protected]>

avocado/utils/process.py

@@ -522,7 +522,7 @@ def flush(self):
                         try:
                             fileno = stream.fileno()
                             os.fsync(fileno)
-                        except UnsupportedOperation:
+                        except UnsupportedOperation, OSError:
                             pass
                 if hasattr(handler, "close"):
                     handler.close()