CI: Remove use of File#deleteOnExit()

Modify the test setup to remove the use of File#deleteOnExit()
. This was a kludge for tests which were not being correctly torn down and many of the unit tests which relies on this pattern. For example, in a CI run on Centos, 924 out of 1082 open files as reported by lsof -p <PID> are like this:

 /tmp/bigdata-DiskWORM-4381837471694413776.jnl (deleted)

The scope of the change should not be that large:

File.deleteOnExit() (24 hits)

I also see:

Options.DELETE_ON_CLOSE (2 hits - it is not in use anywhere)

and

Options.DELETE_ON_EXIT (43 hits)

The DELETE_ON_CLOSE and DELETE_ON_EXIT options in com.bigdata.journal.Options should both be removed.