PYCBC-540: Add provision for Alpha tagging
PYCBC-540: Add provision for Alpha tagging

Change-Id: I136bebb6b4c2727ef5fb79df099c7e608c98d000
(cherry picked from commit dbba2ec1ba83444534d79685fd612be8051dccaf)
Reviewed-on: http://review.couchbase.org/110668
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Tested-by: Ellis Breen <9d8041ac7ead8d3e1f3217c04c7ed5e3098c2381@couchbase.com>
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

couchbase/couchbase-python-client,couchbase/couchbase-python-client