8157957: ClassNotFoundException: jdk.test.lib.JDKToolFinder
Reviewed-by: coleenp, gtriantafill, mseledtsov, iignatyev, dholmes, dsamersoff

8136930: Simplify use of module-system options by custom launchers
Reviewed-by: coleenp, lfoltan, mchung

8156871: Possible concurrency issue with JVM_AddModuleExports
Summary: Need for single PackageEntry flag to determine a package's unqualifed export state.
Reviewed-by: acorn, ctornqvi, dholmes, jiangli