Cherrypick CCV3 internal router simplication - ad368258f69784e799d08a…

[sleungcy-sap]

Cherry picked ad36825

Author: Merric De Launey mdelauney@pivotal.io
Date: Thu Jul 9 21:04:52 2020 +0000
Simplify CCV3 internal router

- Now, we don't need to hit `/v3` before every command to populate the
router. Instead, we have just written the resource names directly into
the routes file.
- Refactor the routes file to be a map keyed by route name, instead of
an array of routes that gets later converted into a map on the fly.
- The `GetInfo()` method now does not return `ccv3.ResourceLinks`,
because we don't hit `/v3`.

Slack discussion where we asked if anyone knew why it was so complicated
(and nobody really knew):
https://cloudfoundry.slack.com/archives/C032824SM/p1594316115396400

Co-authored-by: Merric De Launey <mdelauney@pivotal.io>
Co-authored-by: Reid Mitchell <rmitchell@pivotal.io>

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