CBQE-0: fix in cbtransfertests 'VBucketAwareMemcached' is not defined

Change-Id: I1dfb212610fd2995dbe45fbdd13145e1d8504979
Reviewed-on: http://review.couchbase.org/38234
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>