Fixes #2625

fixes gh-2629

Set hystrix timeout for Zuul routes based on whether the hystrix command timeout, default timeout, or ribbon timeouts are set.  Fixes #2606 (#2633)

* Move Ribbon to its own module. Fixes #2299

* Add logging to RibbonLoadBalancerRetryPolicy

public FeignLoadBalancer.RibbonRequest and FeignLoadBalancer.RibbonResponse to the user to customize their needs (#2536)

* Added util method to upgrade the connection to a secure one.

- Adds support for websocket URIs
- Fixes bug where a non-secure scheme other than http would be changed to https
- Deprecated `updateToHttpsIfNeeded` in favor of `updateToSecureConnectionIfNeeded`

* Expect http when no scheme was set

* Skip update to secure connection when the uri is empty

Fixes gh-808.

* InputStream should always be closed after reading contents from upstreams

* Fixes double encoding when creating secure URLs.  Fixes #2478.

* Adjust the code format

* Add support loadBalancerKey in RibbonRoutingFilter

* Add documentation about how to provide a loadBalancerKey to Ribbon

* Add integrationtest for RibbonRoutingFilter's loadBalancerKey support

* Adds backoff policies when retrying requests.  Fixes #2195

* fixing final variable

Lets user have full control over how the Observable is created with
sane defaults for eager/non-eager cases.

- The fix adds a necessary buffer between the rx-rs adapter and
the timeout operator introduced in AbstractCommand. Unfortunately,
the hystrix operator does not comply with RS backpressure requirements.
It will always request an unbounded demand to a source regardless of
the command consumer demand. With this commit we protect RS adapter and
downstream flow from overflow. Ideally a rework of the operator should
be planned.

* Add new Zuul filters endpoint and refactor routes endpoint
* Refactor FiltersEndpoint
- Extend from AbstractEndpoint and simplify code
- Move tests classes into package endpoint
- Remove usage of Lombok
* Conditionally enable Zuul routes and filters endpoints
* Provide FilterRegistry to FiltersEndpoint via constructor

Otherwise there would be an explosion of overloaded methods.

See https://github.com/spring-cloud/spring-cloud-commons/issues/265

fixes gh-2298