Fix some hacked imports

Move the content of the auth module to better locations

Remove deferred import

Rename vo module to vos

Corresponds to feudalClient@44ddf2bc

We are switching from using Deployment to DeploymentState as deployment
objects (aka what's send to the clients). This is much nicer and
should've been done this way since the beginning.

The changes also entail API changes for the client.

Makes some serializers more terse, and makes unwanted fields read_only.

Also rework the way errors are communicated to the webpage

Makes Deployment and DeploymentState many to many.

Especially adds pending credential states