Rewrite test of primary.register_ecu_manifest: thoroughness++, data++
Rewrite test of primary.register_ecu_manifest: thoroughness++, data++

Use the test data added to tests/test_data/flawed_manifests to test
a variety of ECU Manifests, adding a variety of nonces, and testing
each of them.

uptane/uptane,awwad/uptane,uptane/uptane,awwad/uptane