DERBY-6181; fix AutoloadTest to support running concurrently when different base ports are specified.
  backporting the removal of an unnecessary import (1481448) from trunk.


git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/branches/10.10@1481460 13f79535-47bb-0310-9956-ffa450edef68