fixes gh-1303

fixes gh-1276

fixes gh-1285

Guard creating and creation of classes that use it with @ConditionalOnClass(name = "javax.servlet.http.HttpServletRequest")

fixes gh-1302

Upgrade Eureka to 1.4.11

Upgrade Hystrix to 1.5.5

Updated SC Stream to Brooklyn SNAPSHOT

This fixes a case where the ribbon property is set `ribbon.IsSecure=false`, but because the eureka secure port was enabled, the uri created by ribbon was prefixed with https when it shouldn't have.

All places where isSecure is need have been consolidated into RibbonUtils.

fixes gh-1270

Previously with a `@FeignClient(name="http://bad_hostname")` would pass the start time test and fail later in runtime. The test now fails fast.

fixes gh-1257

This reverts commit 258e53a4.

Make Hystrix Thread Pool available while using Zuul 

Upgrade Feign to 9.3.0

Upgrade Feign to 9.2.0

fixes gh-1266

Conflicts:
	spring-cloud-netflix-core/src/test/java/org/springframework/cloud/netflix/ribbon/RibbonClientConfigurationTests.java

fix 'RibbonRequest' cannot to encode issues

Merge branch 'master' of https://github.com/spring-cloud/spring-cloud-netflix into zuul_hystrix_threadpool

This reverts commit 21df6e43.

A problem in Spring Boot means that the extra conditions are combined
with OR not AND, so it's a bug to have more than one until that
gets fixed (in an AnyNestedCondition).

See https://github.com/spring-projects/spring-boot/pull/6672

Merge branch 'context-path-prefix-support' of https://github.com/kakawait/spring-cloud-netflix into kakawait-context-path-prefix-support

- add zuul.add-host-header property to add Host header
- add port to X-Forwarded-Host as defined in RFC 7239
- extract PreDecorationFilter.filterOrder() into a public constant

fixes gh-1108