* Sessions support for read:self and cancel:self permissions. This is automatic with fallback; no API change is needed.
* Strips out values from listing if only self actions are allowed on the resource and the user ID is different. This prevents a default ACL of id=*;type=session;actions=read:self,cancel:self from causing all values to be visible when listing.
* Adds an unprivileged user to development/testing instances. This user has only default permissions plus the ability to authorize sessions in the default target.
* Remove list:self from main
As per futher discussions, we won't be supporting this, in favor of
simply read:self and cancel:self (since listing now already filters out
items on which you have no permissions).
This doesn't remove list:self entirely from the code base as much of
that will simply be converted to read:self and cancel:self -- that will
be in a later PR. However, with this removed if we want to release we
won't expose an API publicly that isn't going to stick around.
