[rel-2.2.0] switch cbsasl to master branch

For empty password auth fix

Change-Id: Idee060bacc001d88fa9c447a0025c5d6ae8513c3
Reviewed-on: http://review.couchbase.org/28565
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>