Use new render_instance_selector helper
Do not expose service user and passwords in UI

End users don't need to change this (and we already generate a random
password); it can still be changed in the json if really needed.
Do not create proposal if no instance found for barclamp dependencies

We need a rabbitmq instance and a keystone instance to properly
auto-fill the defaults.

Note that the code is already doing this check for database.
Merge pull request #46 from vuntz/render_instance_selector

https://github.com/crowbar/barclamp-quantum/pull/46

Merged by devtool for cloudsleuth