[7.x] Switch Kerberos authentication provider to a dedicated `_kerberos` grant. Introduce `Tokens` for common access/refresh token tasks. (#39366)#40101

Merged

kobelb merged 1 commit intoelastic:7.xfrom kobelb:backport/7.x/pr-39366

Jul 1, 2019

+930-859

Commits on Jul 1, 2019

Switch Kerberos authentication provider to a dedicated _kerberos grant. Introduce Tokens for common access/refresh token tasks. (elastic#39366 )

azasypkin
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kobelb
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