Replace codegangsta/cli with urfave/cli

[andy-a-d-nguyen]

• [x] Read the Contributing document.

Summary

A replace directive is being used here to pin codegangsta/cli's version. codegangsta/cli has been archived, but urfave/cli has the same APIs while still being maintained and routing-release also currently uses negroni, another package from urfave here

This PR removes the replaces codegangsta/cli with urfave/cli and is a companion PR to https://github.com/cloudfoundry/routing-release/pull/423

Backward Compatibility

Breaking Change? No

[andy-a-d-nguyen]

Tracker issue #187603705