Bug 10644: (follow-up) remove inadvertant dependence on Perl 5.14

Perl 5.14 changed array and hash container functions (e.g., keys())
to accept hashrefs or arrayrefs.  However, this doesn't work in
Perl 5.10, so doing

  scalar(keys( function_returning_hashref() ) );

is a syntax error in that version.  This patch changes the affected
tests to explicitly difference the hashrefs returned by the various
functions.

To test:

Verify that t/db_dependent/ClassSource.t passes.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>