Clean up systemtest prereq version numbers from prereq files

[Mesbah-Alam]

• Removes version number from all system test prereq jar locations in top.xml
• Removes version number from all prereq jar references in stf source
• Related to : https://github.com/AdoptOpenJDK/stf/issues/98

Signed-off-by: Mesbah_Alam@ca.ibm.com Mesbah_Alam@ca.ibm.com

[Mesbah-Alam]

Test : Internal-Grinder/13187/