stats.log: cbstats Not Found at the end of QE tests

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memcached stats all

['cbstats', '-a', '127.0.0.1:11209', 'all', '-b', '_admin', '-p', '8b71995871cba4d46766a6511143b2b7']

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******************************************************************************

Traceback (most recent call last):

  File "/opt/couchbase/lib/python/cbstats", line 551, in <module>

    main()

  File "/opt/couchbase/lib/python/cbstats", line 548, in main

    c.execute()

  File "/opt/couchbase/lib/python/clitool.py", line 62, in execute

    f[0](mc, *args[2:], **opts.__dict__)

  File "/opt/couchbase/lib/python/cbstats", line 56, in g

    mc.bucket_select(bucket)

  File "/opt/couchbase/lib/python/mc_bin_client.py", line 426, in bucket_select

    return self._doCmd(memcacheConstants.CMD_SELECT_BUCKET, name, '')

  File "/opt/couchbase/lib/python/mc_bin_client.py", line 130, in _doCmd

    return self._handleSingleResponse(opaque)

  File "/opt/couchbase/lib/python/mc_bin_client.py", line 123, in _handleSingleResponse

    cmd, opaque, cas, keylen, extralen, data = self._handleKeyedResponse(myopaque)

  File "/opt/couchbase/lib/python/mc_bin_client.py", line 119, in _handleKeyedResponse

    raise MemcachedError(errcode,  rv)

mc_bin_client.MemcachedError: Memcached error #1:  Not found

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