[hotfix] [build] Remove outdated and obsolete plugin config in flink-…

…runtime

    This removes an outdates plugin configuration for surefire, excluding
    certain test data files which were way back conflicting with the test
    naming pattern.

flink-runtime/pom.xml

@@ -360,19 +360,12 @@ under the License.
 				</configuration>
 			</plugin>
 
+			<!-- to increase build stability here, do not reuse unit test JVM forks -->
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-surefire-plugin</artifactId>
 				<configuration>
 					<reuseForks>false</reuseForks>
-					<!-- <workingDirectory>${project.build.testOutputDirectory}</workingDirectory> -->
-					<excludes>
-						<exclude>**/TestData.java</exclude>
-						<exclude>**/TestInstanceListener.java</exclude>
-					</excludes>
-					<systemPropertyVariables>
-						<log.level>WARN</log.level>
-					</systemPropertyVariables>
 				</configuration>
 			</plugin>
 			<plugin>