tdunkle

Fix system test modification pattern for `nifgen` to match other drivers and to run tests over gRPC.

1

- [X] This contribution adheres to [CONTRIBUTING.md](https://github.com/ni/nimi-python/blob/master/CONTRIBUTING.md). ~- [ ] I've updated [CHANGELOG.md](https://github.com/ni/nimi-python/blob/master/CHANGELOG.md) if applicable.~ This change does not need to be customer-facing. - [X] I've added tests applicable for...

- [X] This contribution adheres to [CONTRIBUTING.md](https://github.com/ni/nimi-python/blob/master/CONTRIBUTING.md). ~- [ ] I've updated [CHANGELOG.md](https://github.com/ni/nimi-python/blob/master/CHANGELOG.md) if applicable.~ This change does not need to be customer-facing. ~- [ ] I've added tests applicable...

### Description of issue The `nifgen` system-level tests suite doesn't include tests that exercise the `TypeError` throw cases when creating waveforms with numpy. This was pointed out by @marcoskirsch here:...