fixes gh-1616

Fixes gh-1546

Specifically, add `@ConditionalOnBean(EurekaClient.class)`.

Fixes an issue where eureka and ribbon are on the classpath, eureka.client.enabled=false which would cause a bean not found exception.

fixes gh-1511

(cherry picked from commit d1f8c031)

fixes gh-1345

Breaks Spring Boot 1.3 compatibility, enables 1.5

Moving eureka.server.{expectedNumberOfRenewsPerMin,defaultOpenForTrafficCount} to eureka.instance.registry so relaxed binding can be used. Default to old values for backwards compatibility.

This reverts commit 90d6490f.

This reverts commit 088afa6d.

This reverts commit 3c1a23e7.

fixes gh-1285

This reverts commit 258e53a4.

Fixes gh-1205

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

see gh-978
fixes gh-1111

The Angel client has an idiosyncratic way of calculating an instance
id, and the Brixton client aligned with that already, but the
Brixton server did not. This change should make Brixton Eureka
Servers work with Angel clients.

See gh-978

so they don't appear on the dashboard

Fixes gh-974

Protects us against changes in Spring Boot 1.4 where the naming
convention changes.