Default to port zero when port is null

This is a change from consul 1.9->1.10

Fixes gh-760
Fixes gh-759

pom.xml

@@ -156,6 +156,11 @@
 				<artifactId>testcontainers</artifactId>
 				<version>${testcontainers.version}</version>
 			</dependency>
+			<dependency>
+				<groupId>org.testcontainers</groupId>
+				<artifactId>junit-jupiter</artifactId>
+				<version>${testcontainers.version}</version>
+			</dependency>
 		</dependencies>
 	</dependencyManagement>