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/iotdata/responses.py

@@ -0,0 +1,35 @@
+from __future__ import unicode_literals
+from moto.core.responses import BaseResponse
+from .models import iotdata_backends
+import json
+
+
+class IoTDataPlaneResponse(BaseResponse):
+    SERVICE_NAME = 'iot-data'
+
+    @property
+    def iotdata_backend(self):
+        return iotdata_backends[self.region]
+
+    def update_thing_shadow(self):
+        thing_name = self._get_param("thingName")
+        payload = self.body
+        payload = self.iotdata_backend.update_thing_shadow(
+            thing_name=thing_name,
+            payload=payload,
+        )
+        return json.dumps(payload.to_response_dict())
+
+    def get_thing_shadow(self):
+        thing_name = self._get_param("thingName")
+        payload = self.iotdata_backend.get_thing_shadow(
+            thing_name=thing_name,
+        )
+        return json.dumps(payload.to_dict())
+
+    def delete_thing_shadow(self):
+        thing_name = self._get_param("thingName")
+        payload = self.iotdata_backend.delete_thing_shadow(
+            thing_name=thing_name,
+        )
+        return json.dumps(payload.to_dict())