* remove expanding behavior from engines list and add a configuration route
* use page header component, secret tab component for the template on the secret engine configuration route
* move abstraction to secret-list-header and remove secret-tabs
* add attrs to secret engine model and adjust mount controller code to support that
* fix top level nav so that we can use the back button properly
* fix tests
* remove unused response-wrapping route and controller
* move to using the internal mounts endpoint for the secrets list and individual engine lookup
* remove errors about sys/mounts access because we don't need it anymore 🎉
* use modelFor instead of peekRecord for looking up the secret-engine
* remove test because we removed that error page - in the worst case scenario, a user will only have access to cubbyhole, but will see that in the secrets engines list
* make the dev CSP the same as the Go CSP
* update serializer to handle SSH responses as well as new engine fetches
* back out some changes to ttl-picker and field test object so that tests pass
* get rid of trailing space in the secret engine link
* add secrets-engine adapater tests for new query behavior
Matthew Irish