Support spring-boot 2 health check endpoints

[nicolaferraro]

Spring-boot 2 actuator endpoints are different from spring-boot 1. Health is no more provided at "/health" endpoint.

We have encoded the "/health" endpoint in

fabric8-maven-plugin/enricher/fabric8/src/main/java/io/fabric8/maven/enricher/fabric8/SpringBootHealthCheckEnricher.java

Line 94 in f3259fa

withNewHttpGet().withNewPort(port).withPath(prefix + "/health").withScheme(scheme).endHttpGet().

.

We need to detect the major version of spring-boot and use the correct path.

If the health endpoint (or path) can be configured using application.properties in spring-boot 2, we need to read that configuration and change the probes accordingly.