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"}
```
LOCALSTACK_VENV_FOLDER = os.path.join(LOCALSTACK_ROOT_FOLDER, '.venv')
if not os.path.isdir(LOCALSTACK_VENV_FOLDER):
    
    LOCALSTACK_VENV_FOLDER = os.path.realpath(os.path.join(LOCALSTACK_ROOT_FOLDER, '..', '..', '..'))
PATH_USER_REQUEST = '_user_request_'
DOCKER_IMAGE_NAME = 'localstack/localstack'
CONFIG_UPDATE_PATH = '/?_config_'
ENV_INTERNAL_TEST_RUN = 'LOCALSTACK_INTERNAL_TEST_RUN'
APPLICATION_AMZ_JSON_1_0 = 'application/x-amz-json-1.0'
APPLICATION_AMZ_JSON_1_1 = 'application/x-amz-json-1.1'
APPLICATION_JSON = 'application/json'
APPLICATION_X_WWW_FORM_URLENCODED = 'application/x-www-form-urlencoded'
TRUE_STRINGS = ('1', 'true', 'True')
FALSE_STRINGS = ('0', 'false', 'False')
LAMBDA_TEST_ROLE = 'arn:aws:iam::%s:role/lambda-test-role' % TEST_AWS_ACCOUNT_ID
ELASTICSEARCH_JAR_URL = 'https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.7.0.zip'
ELASTICSEARCH_PLUGIN_LIST = ['analysis-icu', 'ingest-attachment', 'analysis-kuromoji',
 'mapper-murmur3', 'mapper-size', 'analysis-phonetic', 'analysis-smartcn', 'analysis-stempel', 'analysis-ukrainian']
ELASTICSEARCH_DELETE_MODULES = ['ingest-geoip']
ELASTICMQ_JAR_URL = 'https://s3-eu-west-1.amazonaws.com/softwaremill-public/elasticmq-server-0.15.2.jar'
STS_JAR_URL = 'https://repo1.maven.org/maven2/com/amazonaws/aws-java-sdk-sts/1.11.14/aws-java-sdk-sts-1.11.14.jar'
STEPFUNCTIONS_ZIP_URL = 'https://s3.amazonaws.com/stepfunctionslocal/StepFunctionsLocal.zip'
DYNAMODB_JAR_URL_ALPINE = 'https://github.com/whummer/dynamodb-local/raw/master/etc/DynamoDBLocal.zip'
DYNAMODB_JAR_URL = 'https://s3-us-west-2.amazonaws.com/dynamodb-local/dynamodb_local_latest.zip'
API_ENDPOINT = os.environ.get('API_ENDPOINT') or 'https://api.localstack.cloud/v1'
LOCALSTACK_WEB_PROCESS = 'LOCALSTACK_WEB_PROCESS'
LOCALSTACK_INFRA_PROCESS = 'LOCALSTACK_INFRA_PROCESS'
MOTO_ACCOUNT_ID = '123456789012'
DEFAULT_LAMBDA_CONTAINER_REGISTRY = 'lambci/lambda'