Fixes gh-1214

We need to still assert that the FeignClient is valid (no name and
value specified together for instance). Added missing tests.

There is a utility method in Spring that we can use to merge all
the aliases. That way 4.2 and 4.3 behave the same way.

Fixes gh-1192

Need to make this class 4.2.x compatible.

see gh-1192

Disable cookie management for RibbonLoadBalancingHttpClient Fixes gh-301

See gh-1105

Upgrade Eureka to 1.4.10.  Fixes #1180.

fixes gh-1175

remove Guava ImmutableMap in favour of Collections.unmodifiab…

fixes gh-1155

Make sanitizeUrlTemplate() protected for easy sub-classing

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