Error using Chalice blueprints

Hi,

I'm working on a project with Chalice and I have an error when I'm using Blueprints that I don't really understand.

My project is organised like that:
```
- my project
- chalicelib
- s3_events.py
- __init__.py
- app.py
```
I created an `s3_events` file to use blueprint like that:
```python
from chalice import Blueprint
s3_event_blueprints = Blueprint(__name__)

@s3_event_blueprints.on_s3_event(bucket="test-bucket", events=["s3:ObjectCreated:*"]")
def handle_object_created(event):
pass
```

And in my `app.py` it's like that:
```python
from chalice import Chalice
from chalicelib.s3_events import s3_event_blueprints

app = Chalice(app_name="panenkapi")
app.register_blueprint(s3_event_blueprints)
```

Then, when I deploy I don't have error, but when I upload a file the lambs function is triggered and I get the following error :
```
[ERROR] Runtime.ImportModuleError: Unable to import module 's3_event_blueprints': No module named 's3_event_blueprints'
```

I saw this issue : https://github.com/aws/chalice/issues/1680 but I already have an `__init__.py` file in chalicelib..

Did I do something wrong with `blueprints` or is it an issue ? How can I solve this ?

Thank you for your help,

Maxime

Start with app.py and chalicelib/s3_events.py, including chalicelib/__init__.py, then deploy the example and trigger the S3 event to reproduce the Runtime.ImportModuleError. Trace which module name Chalice packages and configures for the Lambda handler; done means the uploaded object invokes the blueprint handler without an import error.

Written by the indexing model from the issue text.