Conformance simple backward version and binary files support

Add --test-version option to tosa_verif_conformance_generator to
select the version for tests to output.
Add --output-type to allow json, binary or both files to be created
during conformance generation.
Fix passing schema_path to test runner.
Add explicit verify lib path arg to test runner.

Change-Id: I5f1ad137d713fca408a98470ea77bddf8916c5f3
Signed-off-by: Jeremy Johnson <jeremy.johnson@arm.com>