DERBY-6178 AutoloadTest does not proprogate original jvm -D flags to spawned JVM, leading to LAB regression test failures

backport of change #1467664 from trunk to 10.9 branch.

This change disables the AutoloadTest when a non-default base port is
passed to the test run.  Currently the test does not work correctly
for multiple concurrent runs using different base ports.



git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/branches/10.9@1467688 13f79535-47bb-0310-9956-ffa450edef68