* The prototype stage hard-coding of passwords is replaced by random
generation of passwords for:
* all API services;
* RabbitMQ;
* MySQL;
* OpenStack admin user;
* OpenStack service users;
* Passwords are not replaced upon successive microstack.init calls to
preserve idempotency.
Change-Id: Ic3d6108a81d09bdd09e986f80b3040b030605178
32ad5af7f4