Matt Moyer 33e02aff60 Add extra group constants and validation to `pkg/bootstrap/api`. ... This adds constants and validation for a new `auth-extra-groups` key on `bootstrap.kubernetes.io/token` secrets. This key allows a bootstrap token to authenticate to extra groups in addition to the `system:bootstrappers` group. Extra groups are always applied in addition to the `system:bootstrappers` group, must begin with a `system:bootstrappers:` prefix, are limited in length, and are limited to a restricted set of characters (alphanumeric, colons, and dashes without a trailing colon/dash).		2017-08-25 16:04:53 -05:00
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api	Add extra group constants and validation to `pkg/bootstrap/api`.	2017-08-25 16:04:53 -05:00