Upgrade to Spring Cloud Hoxton

[arey]

• https://spring.io/blog/2019/10/05/spring-cloud-hoxton-m3-is-now-available
• https://spring.io/blog/2019/08/19/spring-cloud-hoxton-m2-released
• https://spring.io/blog/2019/07/03/spring-cloud-hoxton-m1-is-available

[arey]

I've got an issue with application starting with random port (server.port=0).
The application during initialization will report port 0 (random) to Eureka as the port it's running on, resulting in an unreachable service. This problem is similar to the one described to https://blog.joshmlwood.com/eureka-spring-cloud-random-port/

java.net.UnknownHostException: macbook:0: unknown error
	at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
	Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
	|_ checkpoint ⇢ org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain]
	|_ checkpoint ⇢ org.springframework.cloud.sleuth.instrument.web.TraceWebFilter [DefaultWebFilterChain]
	|_ checkpoint ⇢ org.springframework.boot.actuate.metrics.web.reactive.server.MetricsWebFilter [DefaultWebFilterChain]
	|_ checkpoint ⇢ HTTP GET "/api/customer/owners" [ExceptionHandlingWebHandler]
Stack trace:
		at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)

By debugging I found

macbook:0:80

Problem fix with 2.2.0.RC1