implement new token interface

[mjkkirschner]

Purpose

depends on this PR:
DynamoDS/PackageManagerClient#80

implement new interface

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated
• This PR contains no files larger than 50 MB

Release Notes

make single sign on usable from graphs

Reviewers

[mjkkirschner]

pass here:
https://master-5.jenkins.autodesk.com/job/Dynamo/job/DynamoSelfServe/job/pullRequestValidation/9005/

@zeusongit - I notice that this failure occurred AFTER I merged your changes, and I also noticed that these tests actually put real load on the package manager to get the hosts lists - if for some reason the package manager returns an empty list or times out during a test run, the garbage value may now be cached.

I've only seen it infrequently, but perhaps we should either make the cache short lived, only cache if the result is not garbage, and in addition make these tests use mocks.