* vault-agent-cache: squashed 250+ commits

* Add proper token revocation validations to the tests

* Add more test cases

* Avoid leaking by not closing request/response bodies; add comments

* Fix revoke orphan use case; update tests

* Add CLI test for making request over unix socket

* agent/cache: remove namespace-related tests

* Strip-off the auto-auth token from the lookup response

* Output listener details along with configuration

* Add scheme to API address output

* leasecache: use IndexNameLease for prefix lease revocations

* Make CLI accept the fully qualified unix address

* export VAULT_AGENT_ADDR=unix://path/to/socket

* unix:/ to unix://