[8u] RFR 8229501: jdk/test/lib/testlibrary/ClassFileInstaller.java should match hotspot//test/testlibrary version

[Verghese, Clive]

Hi,

Requesting review for webrev : http://cr.openjdk.java.net/~phh/8229501/webrev.8u.00/
JBS Issue : https://bugs.openjdk.java.net/browse/JDK-8229501
Email discussion : https://mail.openjdk.java.net/pipermail/jdk8u-dev/2019-August/010029.html

hotspot/test/testlibrary/ClassFileInstaller.java and jdk/test/lib/testlibrary/ClassFileInstaller were merged as part of the JDK10 repo merge. For 8u, we should sync the JDK version with the Hotspot version in order to facilitate backports of patches such as the one for JDK-8216401<https://bugs.openjdk.java.net/browse/JDK-8216401> that assume the merged version.

Testing
                Validated that the test depending on ClassFileInstaller pass.


Regards,
Clive Verghese