DERBY-3838; Convert derbynet/DerbyNetAutoStart to JUnit
  backporting revision 1462304 and 1462677 from 10.9.


git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/branches/10.8@1462681 13f79535-47bb-0310-9956-ffa450edef68