* 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.
This adds parsing and validation for grant strings along with the ability to create canonical JSON and text strings from a grant.
It also adds an ACL implementation, allowing a collection of grant strings to then be checked against a resource/action tuple and indicate if it's allowed.
Note that only specific sets of provided data in grant strings is allowed. This vastly simplifies logic.
Test coverage is 100%.
A future update will consolidate and migrate types between this and IAM but I didn't want to mix that in with this.
Jeff Mitchell