7468: Fix jdp test coverage

Reviewed-by: hirt

Author: aptmac

core/tests/org.openjdk.jmc.jdp.test/pom.xml

@@ -64,7 +64,7 @@
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-surefire-plugin</artifactId>
 				<configuration>
-					<argLine>-Djava.net.preferIPv4Stack=true</argLine>
+					<argLine>-Djava.net.preferIPv4Stack=true @{surefireArgLine}</argLine>
 				</configuration>
 			</plugin>
 		</plugins>