RFR{S}: 8166837: [TESTBUG] Fix tests on Linux/s390x

[Lindenmaier, Goetz]

Hi,

This are the changes needed to the tests in the jdk repository
to work with s390.
In test/sun/tools/jhsdb I just use the other Platform.java which
gets it's shouldSAAttach() method changed to return 'false' on
S390.  (I sent that part of the change to the hs-compiler list.)

test/java/awt/JAWT/JAWT.sh is just skipped.

Please review this change.
http://cr.openjdk.java.net/~goetz/wr16/8166837-jtreg_fixes/jdk-wr.01/

Best regards,
  Goetz.