[svn-r15835] Refactored tests of code to mark and unmark the HDF5 file as having

journaling in progress to avoid calls to fork().  Did this by creating
cache2_jnl_file_marking (a program that sets up or checks the results
of the specified file marking test depending on parameters passed to 
it) and test/testjnlfilemarking.sh (a shell script to call 
cache2_jnl_file_marking and report results).

Also fixed an input validation bug in src/H5AC.c in passing.

Tested on Phoenix (serial -- debug and production mode)
          Kagiso  (parallel)
	  Linew   (serial)

There was another checkin during these tests.  As the changes looked
orthoginal to mine, I updated and retested on Phoenix (serial / debug)
only before this checkin.

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