feature(huey): use RedisHuey

I did it for testing redis socketing too, but I guess this will wait for
another time. Somehow it worked even without an actual redis socket and it was
creepy. Idk yet how one can best make redis to make sockets at arbitrary
temporary dirs without starting another redis.

@@ -2,3 +2,4 @@ from selfprivacy_api.utils.huey import huey
 from selfprivacy_api.jobs.test import test_job
 from selfprivacy_api.backup.tasks import *
 from selfprivacy_api.services.generic_service_mover import move_service
+from tests.test_huey import sum

@@ -1,16 +1,23 @@
 """MiniHuey singleton."""
 import os

@@ -0,0 +1,48 @@
+import pytest
+
+from subprocess import Popen
+from os import environ, path