Support iot and iot-data (#1303)

* append appropriate urls when scaffolding

* make dispatch for rest-api

* fix dispatch for rest-json

* fix moto/core/response to obtain path and body parameters

* small fixes

* remove unused import

* fix get_int_param

* Add features of things and thing-types

* fix scaffold

* basic crud of cert

* support basic CRUD of policy

* refactor

* fix formatting of scaffold

* support principal_pocicy

* support thing_principal

* update readme

* escape service to handle service w/ hyphen like iot-data

* escape service w/ hyphen

* fix regexp to extract region from url

* escape service

* Implement basic iota-data feature

* iot-data shadow delta

* update readme

* remove unused import

* remove comment

* fix syntax

* specify region when creating boto3 client for test

* use uuid for seed of generating cert id

* specify region_name to iotdata client in test

* specify region to boto3 client in moto response

* excude iot and iotdata tests on server mode

* fix handling of thingTypeName in describe-thing

* test if server is up for iot

moto/core/responses.py

@@ -214,7 +214,7 @@ class BaseResponse(_TemplateEnvironmentMixin):
         if not hasattr(self, 'SERVICE_NAME'):
             return None
         service = self.SERVICE_NAME
-        conn = boto3.client(service)
+        conn = boto3.client(service, region_name=self.region)
 
         # make cache if it does not exist yet
         if not hasattr(self, 'method_urls'):