Authentication changes

[ndchandar]

IAuthenticator.checkValid should return CompletableFuture<Boolean>

Notes

1. I can add more tests based on review/feedback
2. Once the PR is approved, i can work similar changes for IAuthorizatorPolicy

[ndchandar]

@andsel Pinging for review. The Travis build failures seems independent of this PR.

[andsel]

Hi Dinesh, I'm slow on review, to find some time to work on this. But don't worry. Thanks for start contributing Andrea

…

On Mon, Oct 14, 2019 at 10:13 PM Dinesh Narayanan ***@***.***> wrote: @andsel <https://github.com/andsel> Pinging for review. The Travis build failures seems independent of this PR. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#507?email_source=notifications&email_token=AAH5RUMKVVW235LHQGNGVBTQOTHGTA5CNFSM4I77QJ6KYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEBGKWGA#issuecomment-541895448>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAH5RULZ24VAP5P3ITL7GHLQOTHGTANCNFSM4I77QJ6A> .