With today's update, API Gateway consistently fails to find any of its' defined paths.

For example, the following `serverless.yml` :
```yaml
service: "localtest"

provider:
  name: "aws"
  runtime: "nodejs10.x"

functions:
  hello:
    handler: "handler.hello"
    events:
      - http:
          path: "/"
          method: "get"
          integration: "lambda-proxy"
      - http:
          path: "/test"
          method: "get"
          integration: "lambda-proxy"
plugins:
  - "serverless-localstack"

custom:
  localstack:
    stages:
      - "local"
```

If deployed, will result in the following:
```
~$ sls deploy --stage local
Serverless: Using serverless-localstack
Serverless: Packaging service...
Serverless: Excluding development dependencies...
Serverless: Creating Stack...
Serverless: Checking Stack create progress...
.
Serverless: Stack create finished...
Serverless: Uploading CloudFormation file to S3...
Serverless: Uploading artifacts...
Serverless: Uploading service localtest.zip file to S3 (3.02 KB)...
Serverless: Validating template...
Serverless: Skipping template validation: Unsupported in Localstack
Serverless: Updating Stack...
Serverless: Checking Stack update progress...
.
Serverless: Stack update finished...
Service Information
service: localtest
stage: local
region: us-east-1
stack: localtest-local
resources: 11
api keys:
  None
endpoints:
  GET - http://localhost:4567/restapis/sz3ijrff91/local/_user_request_/
  GET - http://localhost:4567/restapis/sz3ijrff91/local/_user_request_/test
functions:
  hello: localtest-local-hello
layers:
  None
Serverless: Run the "serverless" command to setup monitoring, troubleshooting and testing.
~$ curl http://localhost:4567/restapis/sz3ijrff91/local/_user_request_/
{"message": "Unable to find integration for path /restapis/sz3ijrff91/local/_user_request_/"}
~$ curl http://localhost:4567/restapis/sz3ijrff91/local/_user_request_/test
{"message": "Unable to find integration for path /restapis/sz3ijrff91/local/_user_request_/test"}
```
func_arn = uri.split(':lambda:path')[1].split('functions/')[1].split('/invocations')[0]
            data_str = json.dumps(data) if isinstance(data, (dict, list)) else data
            account_id = uri.split(':lambda:path')[1].split(':function:')[0].split(':')[-1]
            source_ip = headers['X-Forwarded-For'].split(',')[-2]
            
            
            request_context = {
                'path': relative_path,
                'accountId': account_id,
                'resourceId': resource.get('id'),
                'stage': stage,
                'identity': {
                    'accountId': account_id,
                    'sourceIp': source_ip,
                    'userAgent': headers['User-Agent'],
                }
            }
            try:
                path_params = extract_path_params(path=relative_path, extracted_path=extracted_path)
            except Exception:
                path_params = {}
            result = lambda_api.process_apigateway_invocation(func_arn, relative_path, data_str,
                headers, path_params=path_params, query_string_params=query_string_params,
                method=method, resource_path=path, request_context=request_context)
            if isinstance(result, FlaskResponse):
                return flask_to_requests_response(result)
            if isinstance(result, Response):
                return result
            response = Response()
            parsed_result = result if isinstance(result, dict) else json.loads(result)