Revert "use add-opens in surefire only when running in jdk9+"

This reverts commit 5a5abd4.

Author: diegomarquezp

pom.xml

@@ -220,6 +220,15 @@
             </execution>
           </executions>
         </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-surefire-plugin</artifactId>
+          <configuration>
+            <!-- This arg line allows inter-module access when Gson serializes
+            the private variables of java.time.Duration -->
+            <argLine>--add-opens java.base/java.time=ALL-UNNAMED</argLine>
+          </configuration>
+        </plugin>
       </plugins>
     </pluginManagement>
   </build>
@@ -299,25 +308,4 @@
       </plugin>
     </plugins>
   </reporting>
-  <profiles>
-    <profile>
-      <id>java9</id>
-      <activation>
-        <jdk>[9,)</jdk>
-      </activation>
-      <build>
-        <plugins>
-          <plugin>
-            <groupId>org.apache.maven.plugins</groupId>
-            <artifactId>maven-surefire-plugin</artifactId>
-            <configuration>
-              <!-- This arg line allows inter-module access when Gson serializes
-              the private variables of java.time.Duration -->
-              <argLine>--add-opens java.base/java.time=ALL-UNNAMED</argLine>
-            </configuration>
-          </plugin>
-        </plugins>
-      </build>
-    </profile>
-  </profiles>
 </project>