Fixes: https://github.com/pulumi/pulumi-terraform-bridge/issues/119
This allows us to specify an overlays block e.g.
```
Overlay: &tfbridge.OverlayInfo{
DestFiles: []string{
"pulumi_docker/docker.py",
"pulumi_docker/image.py",
},
},
```
The overlays files are treated differently to normal module files
as they are not generated. This structure means that we will emit
the correct entries in the __init__.py file
Without this structure (ie. pulumi_pkgname), the generator actually
copies the file (i.e. docker.py) to the root of the Python SDK. This
is because the structure of the Python SDK has a sub-folder than that
of the NodeJS SDK
I tested this using PR https://github.com/pulumi/pulumi-docker/pull/141
and this now works as expected and we can take advantage of the new
Python overlays for Docker
- Make go comment generation lint-clean for blank comment lines
- Fix the casing of `Provider.py` in Python to `provider.py`
- Fix a spacing issue in the NodeJS code generator
Replace the various `defaults` maps in the schema with per-property
`default` and `defaultInfo` fields. The former holds the static default
value; the latter holds the envvars and language-specific info.
Also, fix a minor bug in the Python codegen that caused diffs in
property docstrings.
The schema format is described in pkg/codegen/schema/schema.go. The code
generators are derived from the code generators contained in
https://github.com/pulumi/pulumi-terraform-bridge/pkg/tfgen, with the
exception of the Go code generator, which is net new.
