MB-10499: Dont save any password in cbb file

Change-Id: I600737d327d0dd8347eaab1fba309b2a90d1b437
Reviewed-on: http://review.couchbase.org/35609
Reviewed-by: Bin Cui <bin.cui@gmail.com>
Tested-by: Bin Cui <bin.cui@gmail.com>