Remove @EnableDiscoveryClient annotation

According to the Official Spring Cloud docs, it is not required anymore:
"@EnableDiscoveryClient is no longer required. You can put a
DiscoveryClient implementation on the classpath to cause the Spring Boot
application to register with the service discovery server."

See: https://docs.spring.io/spring-cloud-commons/reference/4.1/spring-cloud-commons/common-abstractions.html#discovery-client

Closes gh-18

spring-boot-admin/src/main/java/org/example/teahouse/sba/SbaApplication.java

@@ -6,12 +6,10 @@
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.context.metrics.buffering.BufferingApplicationStartup;
-import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
 import org.springframework.context.annotation.Import;
 import org.springframework.context.annotation.PropertySource;
 
 @EnableAdminServer
-@EnableDiscoveryClient
 @SpringBootApplication
 @PropertySource("classpath:build.properties")
 @Import({CommonActuatorConfig.class})

tea-service/src/main/java/org/example/teahouse/tea/TeaServiceApplication.java

@@ -3,13 +3,11 @@
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.context.metrics.buffering.BufferingApplicationStartup;
-import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
 import org.springframework.cloud.openfeign.EnableFeignClients;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.PropertySource;
 
 @EnableFeignClients
-@EnableDiscoveryClient
 @SpringBootApplication
 @PropertySource("classpath:build.properties")
 @ComponentScan(basePackages = { "org.example.teahouse" })

tealeaf-service/src/main/java/org/example/teahouse/tealeaf/TealeafServiceApplication.java

@@ -3,11 +3,9 @@
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.context.metrics.buffering.BufferingApplicationStartup;
-import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.PropertySource;
 
-@EnableDiscoveryClient
 @SpringBootApplication
 @PropertySource("classpath:build.properties")
 @ComponentScan(basePackages = { "org.example.teahouse" })

water-service/src/main/java/org/example/teahouse/water/WaterServiceApplication.java

@@ -3,11 +3,9 @@
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.context.metrics.buffering.BufferingApplicationStartup;
-import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.PropertySource;
 
-@EnableDiscoveryClient
 @SpringBootApplication
 @PropertySource("classpath:build.properties")
 @ComponentScan(basePackages = { "org.example.teahouse" })