tests: test eq and ne operators of fields and values against arbitrary objects and...

The binary operator tests that test comparing fields and values against
arbitrary objects and None are skipped for the eq and ne operators.
This patch modifies the tests to test those operators too.  Unlike other
operators, we don't expect them to raise an Exception.

Change-Id: Ia5f3c64d8223addc436ac23909e36f81814befee
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/2206
Tested-by: jenkins <jenkins@lttng.org>
Reviewed-by: Francis Deslauriers <francis.deslauriers@efficios.com>