Make sure java_home is set before we check-for-tools-jar

[Mesbah-Alam]

• Invoke setup-java-properties target to setup java_home to be used (in case of getDependency build, we are passing in a jdk8 sdk via -Djava.home into the Ant configure script).
• To avoid confusion, use java_java_specification_version to check java version to determine if tools.jar is needed (only needed for jdk8). This is especially relevant for getDependency build where JAVA_HOME is not setup by TKG.

Resolves backlog/issues/1066

[Mesbah-Alam]

• Test with getDependency build: /systemtest.getDependency/115.

setup-java-properties:
     [echo] java_home is ${java_home}
     [echo] java.home is /home/jenkins/workspace/systemtest.getDependency/j2sdk-image/jre
   [delete] Deleting: /tmp/openjdk.java.build.properties.1081129999
     [echo] java_platform set to linux_x86-64
     [echo] java_java_specification_version set to 1.8
     [echo] java_java_vm_vendor set to Temurin
     [echo] java_bindir set to /home/jenkins/workspace/systemtest.getDependency/j2sdk-image/jre/../bin
     [echo] java_compiler set to /home/jenkins/workspace/systemtest.getDependency/j2sdk-image/bin/javac

check-for-tools-jar:
     [echo] java_java_specification_version is 1.8

configure-tools-jar:
     [echo] configure-tools-jar: Copying /home/jenkins/workspace/systemtest.getDependency/j2sdk-image/jre/../bin/../lib/tools.jar to /home/jenkins/workspace/systemtest.getDependency/systemtest_prereqs/tools
     [copy] Copying 1 file to /home/jenkins/workspace/systemtest.getDependency/systemtest_prereqs/tools

• Sanity check with system test : Grinder_JCK/1258.