fixes gh-1143

* orchit-master:
  Adds ability to disable hostname validation.

Adds property zuul.sslHostnameValidationEnabled to be able to disable the hostname validation in the simpleHostRoutingFilter

fixes gh-1057

This allows developers to customize the request builders for zuul requests to inject headers or modify the request in general.  Each zuul request type (RestClient, Apache HttpClient and OkHttp) is supported.

fixes gh-1141

Previously ProxyRequestHelper contained a TraceRepository field. This caused zuul apps to fail with a class not found exception if they excluded actuator. This splits TraceRepository functionality into a new TraceProxyRequestHelper that extends ProxyRequestHelper. Auto configuration creates the appropriate ProxyRequestHelper based on the existence or not of actuator classes.

fixes gh-1135

Also added descriptions to properties.

fixes gh-1131

Made it public and undid other refactorings.

Allows ribbon class name properties to be used to define beans.

This seems like boilerplate, but works, though not easily extensible.

fixes gh-927

instead of defaulting to false.

Fixes gh-1126

Adds a OkHttpRibbonCommand and accomanying classes. They should be
considered beta.

Refactors zuul ribbon command classes and tests.

fixes gh-1125

fixes gh-1081

Zuul sets an empty entity for GET requests. The apache http client either sets transfer encoding to chunked or a content length header. This change sets the apache entity contentLength to 0 (not the header), to that in RequestContent the "content-length" header is set to 0 rathern than transfer encoding.

See gh-1042

If the content length isn't set on the entity, when http client determines which header to set, it sets transfer-encoding to chunked rather than content-length.

This fixes a missing content-length issue when using `HttpClientRibbonCommandFactory`.

See gh-1042

* pull1120:
  Fix hystrix dashboard TPS.

fixes gh-1113

See https://github.com/Netflix/Hystrix/issues/1251

Eliminates a legacy use of a static singleton. This will help allow multiple registrations.

Updates so CloudJacksonJson extension is properly recognized by Eureka
Server as LegacyJacksonJson.

see gh-978
fixes gh-1111

Conflicts:
	spring-cloud-netflix-dependencies/pom.xml

It isn't very helpful to have a Collection converted to a String
anyway. We need to implement something new in Feign to apply
the converter (expander) to individual elements in the collection
but this change should get back to the old behaviour with
List<String> at least.

Fixes gh-1115

Upgrade to zuul 1.2.2

fixes gh-1091
closes gh-958

fixes gh-1110

fixes gh-1110