MB-100: add aws_ini to buildout scripts

Change-Id: I81fc0867042a6ec8a8ee544d24e8859b07195fd5
Reviewed-on: http://review.couchbase.org/25188
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Pavel Paulau <pavel.paulau@gmail.com>