Register env repo properties as beans.

The `CompositeEnvironmentBeanFactoryPostProcessor` binds the required properties for a EnvironmentRepositoryFactory, but does not register it as a bean. This is now done with a supplier to the bound instance.

Fixes gh-1720

spring-cloud-config-sample/src/test/java/sample/ApplicationBootstrapTests.java

@@ -29,6 +29,7 @@ import org.springframework.boot.actuate.autoconfigure.endpoint.web.WebEndpointPr
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.web.client.TestRestTemplate;
 import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.cloud.config.server.environment.MultipleJGitEnvironmentProperties;
 import org.springframework.cloud.config.server.test.ConfigServerTestUtils;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.test.context.junit4.SpringRunner;
@@ -107,4 +108,12 @@ public class ApplicationBootstrapTests {
 		assertThat(property).containsEntry("value", "bar");
 	}
 
+	@Test
+	public void propertiesBeansRegisterByCompositeEnvBeanFactoryPostProcessor() {
+		String[] beanNames = server
+				.getBeanNamesForType(MultipleJGitEnvironmentProperties.class);
+		assertThat(beanNames).isNotNull()
+				.anyMatch(s -> s.matches("git-env-repo-properties\\d"));
+	}
+
 }