Revise the implementation in container exec_resize

This patch revises the client to be robust to handle exception from server
when doing exec_resize, and make the outcome to be similar as docker.

Change-Id: Idcef0b7a368db34df3fcd03ef83c1d5bd45aadb7
Closes-Bug: #1732498

zunclient/common/websocketclient/websocketclient.py

@@ -33,6 +33,7 @@ import websocket
 
 import docker
 
+from zunclient.common.apiclient import exceptions as acexceptions
 from zunclient.common.websocketclient import exceptions
 
 LOG = logging.getLogger(__name__)
@@ -198,6 +199,8 @@ class BaseClient(object):
                 self.tty_resize(height=rows, width=cols)
             except IOError:  # Container already exited
                 pass
+            except acexceptions.BadRequest:
+                pass
 
     def tty_size(self, fd):
         """Get the tty size