Closing and restarting WireMock stub after and before each test (#707)

fixes gh-665

samples/standalone/restdocs/http-client/src/main/java/com/example/loan/ServiceProperties.java

@@ -0,0 +1,17 @@
+package com.example.loan;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+@ConfigurationProperties("service")
+public class ServiceProperties {
+
+	private int port = 8080;
+
+	public void setPort(int port) {
+		this.port = port;
+	}
+
+	public int getPort() {
+		return this.port;
+	}
+}