Tune max heap size for tests

This is an attempt to fix crashes observed on the new Jenkins
infrastructure running on Kubernetes [1].

Increase it to 512m for
- org.eclipse.jgit.ant.test
- org.eclipse.jgit.http.test
- org.eclipse.jgit.lfs.server.test
- org.eclipse.jgit.lfs.test
- org.eclipse.jgit.pgm.test

Decrease it to 768m for
- org.eclipse.jgit.test

[1] e.g. https://ci-staging.eclipse.org/jgit/job/stable/job/jgit.gerrit/16074/console

Change-Id: Id074ed0f7bcb8a13da649a547342af2a08439d9f
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
(cherry picked from commit e19e859977)

org.eclipse.jgit.ant.test/pom.xml

@@ -105,7 +105,7 @@
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <argLine>-Xmx256m -Dfile.encoding=UTF-8 -Djava.io.tmpdir=${project.build.directory}</argLine>
+          <argLine>@{argLine} -Xmx512m -Dfile.encoding=UTF-8 -Djava.io.tmpdir=${project.build.directory}</argLine>
         </configuration>
       </plugin>
     </plugins>

org.eclipse.jgit.http.test/pom.xml

@@ -139,7 +139,7 @@
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <argLine>-Djava.io.tmpdir=${project.build.directory}  -Xmx300m</argLine>
+          <argLine>@{argLine} -Djava.io.tmpdir=${project.build.directory}  -Xmx512m</argLine>
           <includes>
             <include>**/*Test.java</include>
             <include>**/*Tests.java</include>

org.eclipse.jgit.lfs.server.test/BUILD

@@ -32,7 +32,7 @@ junit_tests(
         exclude = TEST_BASE,
     ),
     jvm_flags = [
-        "-Xmx256m",
+        "-Xmx512m",
         "-Dfile.encoding=UTF-8",
     ],
     tags = ["lfs-server"],

org.eclipse.jgit.lfs.server.test/pom.xml

@@ -137,7 +137,7 @@
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <argLine>-Djava.io.tmpdir=${project.build.directory}  -Xmx300m</argLine>
+          <argLine>@{argLine} -Djava.io.tmpdir=${project.build.directory}  -Xmx512m</argLine>
         </configuration>
       </plugin>
     </plugins>

org.eclipse.jgit.lfs.test/pom.xml

@@ -111,7 +111,7 @@
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <argLine>-Djava.io.tmpdir=${project.build.directory}  -Xmx300m</argLine>
+          <argLine>@{argLine} -Djava.io.tmpdir=${project.build.directory}  -Xmx512m</argLine>
         </configuration>
       </plugin>
     </plugins>

org.eclipse.jgit.pgm.test/BUILD

@@ -7,7 +7,7 @@ junit_tests(
     name = "pgm",
     srcs = glob(["tst/**/*.java"]),
     jvm_flags = [
-        "-Xmx256m",
+        "-Xmx512m",
         "-Dfile.encoding=UTF-8",
     ],
     tags = ["pgm"],

org.eclipse.jgit.pgm.test/pom.xml

@@ -109,7 +109,7 @@
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <argLine>-Djava.io.tmpdir=${project.build.directory}</argLine>
+          <argLine>@{argLine} -Xmx512m -Djava.io.tmpdir=${project.build.directory}</argLine>
         </configuration>
       </plugin>
     </plugins>

org.eclipse.jgit.test/pom.xml

@@ -157,7 +157,7 @@
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <argLine>-Xmx1024m -Dfile.encoding=UTF-8 -Djava.io.tmpdir=${project.build.directory}</argLine>
+          <argLine>@{argLine} -Xmx768m -Dfile.encoding=UTF-8 -Djava.io.tmpdir=${project.build.directory}</argLine>
           <includes>
             <include>**/*Test.java</include>
             <include>**/*Tests.java</include>