corrected cache key RE DBOARD3-459

inventory_provider/tasks/worker.py

@@ -1818,7 +1818,7 @@ def final_task(self):
 
 
 def populate_poller_interfaces_cache(warning_callback=lambda s: None):
-    no_lab_cache_key = 'classifier-cache:poller-interfaces:all:no-lab'
+    no_lab_cache_key = 'classifier-cache:poller-interfaces:all:no_lab'
     all_cache_key = 'classifier-cache:poller-interfaces:all'
     non_lab_populated_interfaces = None
     all_populated_interfaces = None

test/test_worker.py

@@ -499,10 +499,10 @@ def test_populate_poller_interfaces_cache(
                  return_value=r)
 
     populate_poller_interfaces_cache()
-    assert r.exists("classifier-cache:poller-interfaces:all:no-lab")
+    assert r.exists("classifier-cache:poller-interfaces:all:no_lab")
     assert r.exists("classifier-cache:poller-interfaces:all")
     no_lab = \
-        r.get("classifier-cache:poller-interfaces:all:no-lab").decode("utf-8")
+        r.get("classifier-cache:poller-interfaces:all:no_lab").decode("utf-8")
     all = r.get("classifier-cache:poller-interfaces:all").decode("utf-8")
     assert json.loads(no_lab) == no_lab_res
     all_res = no_lab_res + lab_res