[PATCH FOR REVIEW] 7194032: update tests for upcoming changes for jtreg

[Jonathan Gibbons]

Currently, jtreg incorrectly confuses the concept of the /directory/ in 
which the test's class will be written with the /classpath/ used to 
locate all of the test's classes, including any library classes. It 
provides env variable TESTCLASSES and system property test.classes, and 
tests use these in different contexts to mean both a directory and a 
classpath.

jtreg will be fixed to separate the two concepts, such that 
TESTCLASSES/test.classes will continue to mean the /directory/ in which 
the test's class will the written, and will introduce 
TESTCLASSPATH/test.class.path for the classpath used to locate all the 
test's classes.

This change only affects a small number of tests, which use @library and 
TESTCLASSES. Two RMI tests are affected.

FAILED: java/rmi/activation/Activatable/extLoadedImpl/ext.sh
FAILED: java/rmi/registry/readTest/readTest.sh

The fix is to update the tests where they are using 
TESTCLASSES/test.classes as a classpath.

To ease migration onto the new jtreg, it is suggested that the tests 
check to see if the new variables are defined (i.e. new jtreg) and to 
fall back on the old variables if they are not defined (i.e. old jtreg). 
In shell terms, this can be written
     ${TESTCLASSPATH:-${TESTCLASSES}}

The patch can be seen here:
     http://cr.openjdk.java.net/~jjg/7194032/webrev.00/

See also
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7194032