Add initial templating support to Vault credential libraries
This adds support for templating various account and user values into
Vault dynamic credential library POST bodies and GET/POST paths.
It also unifies how parameters are used in grants, with backwards
compatibility.
* Move the server daemons into their own package
With this change the internal/server package now is dedicated to the server domain (workers and controllers) and not to the server daemons.
The hope is that this will make it easier to keep the daemons decoupled from the representation of the servers in the database.
Johan Brandhorst-Satzkorn
Jeff Mitchell
Todd