MB-8260: Change sasl library to cbsasl

Change-Id: If212992011e4adcbe26ae741e35c5af787cde18b
Reviewed-on: http://review.couchbase.org/28095
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>