Remove the per-module Surefire --add-opens flags

The `--add-opens` flags needed by the tests of the credential store config
filter, the HBase2 sink and the Kudu sink are now provided by the Surefire
`argLine` of `flume-parent` (apache/logging-flume#502), which also adds
the `java.base/java.lang` opens required by the `EnvironmentVariables`
rule on Windows.

Assisted-By: Claude Fable 5.1 <noreply@anthropic.com>

Author: ppkarwasz

flume-hadoop-credential-store-config-filter/pom.xml

@@ -55,16 +55,4 @@
     </dependency>
   </dependencies>
 
-  <build>
-    <plugins>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-surefire-plugin</artifactId>
-        <configuration>
-          <argLine>-Djava.net.preferIPv4Stack=true --add-opens java.base/java.util=ALL-UNNAMED</argLine>
-        </configuration>
-      </plugin>
-    </plugins>
-  </build>
-
 </project>

flume-hbase2-sink/pom.xml

@@ -125,16 +125,4 @@
 
   </dependencies>
 
-  <build>
-    <plugins>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-surefire-plugin</artifactId>
-        <configuration>
-          <argLine>-Djava.net.preferIPv4Stack=true --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.lang.reflect=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED</argLine>
-        </configuration>
-      </plugin>
-    </plugins>
-  </build>
-
 </project>

flume-kudu-sink/pom.xml

@@ -88,14 +88,6 @@
 
   <build>
     <plugins>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-surefire-plugin</artifactId>
-        <configuration>
-          <!-- The Kudu test utilities install a fake DNS through reflection -->
-          <argLine>-Djava.net.preferIPv4Stack=true --add-opens java.base/java.net=ALL-UNNAMED</argLine>
-        </configuration>
-      </plugin>
       <plugin>
         <groupId>org.apache.avro</groupId>
         <artifactId>avro-maven-plugin</artifactId>