Attempt to create a snapshot from the volume with the name containing non-ascii characters fail

[Sergey Gotliv]

Steps to Reproduce:
1. Create a volume with some extended unicode characters
2. Create a snapshot
3. Fails

Exception during message handling: 'ascii' codec can't encode characters in position 125-126: ordinal not in range(128)

 2016-02-17 09:05:09.898 14856 TRACE oslo_messaging.rpc.dispatcher Traceback (most recent call last):
 2016-02-17 09:05:09.898 14856 TRACE oslo_messaging.rpc.dispatcher File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 142, in _dispatch_and_reply
 2016-02-17 09:05:09.898 14856 TRACE oslo_messaging.rpc.dispatcher executor_callback))
2016-02-17 09:05:09.898 14856 TRACE oslo_messaging.rpc.dispatcher File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 186, in _dispatch
 2016-02-17 09:05:09.898 14856 TRACE oslo_messaging.rpc.dispatcher executor_callback)
2016-02-17 09:05:09.898 14856 TRACE oslo_messaging.rpc.dispatcher File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
 2016-02-17 09:05:09.898 14856 TRACE oslo_messaging.rpc.dispatcher result = func(ctxt, **new_args)
2016-02-17 09:05:09.898 14856 TRACE oslo_messaging.rpc.dispatcher File "/usr/lib/python2.7/site-packages/osprofiler/profiler.py", line 102, in wrapper
2016-02-17 09:05:09.898 14856 TRACE oslo_messaging.rpc.dispatcher info["function"]["kwargs"] = str(kwargs)
2016-02-17 09:05:09.898 14856 TRACE oslo_messaging.rpc.dispatcher UnicodeEncodeError: 'ascii' codec can't encode characters in position 125-126: ordinal not in range(128)