Hide consul token on UI page

[roman-vynar]

Currently, when you go to Status->Configuration page on UI, you will see that password field in basic_auth section is hidden by <hidden>. However, consul token is not.
For example:

  - job_name: dev
    scheme: https
    basic_auth:
      username: prom
      password: <hidden>
    consul_sd_configs:
      - server: consul.example.com:8500
        token: 140ddb9e-d1a9-45d2-a182-dcb9ed89fed2
        datacenter: us-west-1
        scheme: https
        services: [ consul ]

I would have sent a PR but I couldn't find where 😇

[brian-brazil]

https://github.com/prometheus/prometheus/blob/master/config/config.go#L838 should have type Secret if you'd like to fix it. The unittests will need updating too.

[lock]

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