8081347: Add @modules to jdk_core testsReviewed-by: alanb, joehw, lanceaContributed-by: alexander.kulyakhtin@oracle.com, alan.bateman@oracle.com, mandy.chung@oracle.com
8039438: Some tests depend on internal API sun.misc.IOUtilsSummary: Remove dependency on sun.misc.IOUtils.readFully(InputStream, int, boolean)Reviewed-by: alanb, mchung, chegarContributed-by: Alexandre Iline <alexandre.iline@oracle.com>
8031572: jarsigner -verify exits with 0 when a jar file is not properly signedReviewed-by: mullan