cleanup warnings

Author: danielgerlag

src/providers/WorkflowCore.LockProviders.SqlServer/SqlLockProvider.cs

@@ -133,12 +133,9 @@ public async Task ReleaseLock(string Id)
             }
         }
 
-        public async Task Start()
-        {         
-        }
-
-        public async Task Stop()
-        {
-        }
+        public Task Start() => Task.CompletedTask;
+        
+        public Task Stop() => Task.CompletedTask;
+        
     }
 }

src/providers/WorkflowCore.Providers.Azure/Services/AzureLockManager.cs

@@ -93,13 +93,15 @@ public async Task Start()
             _renewTimer = new Timer(RenewLeases, null, RenewInterval, RenewInterval);
         }
 
-        public async Task Stop()
+        public Task Stop()
         {
             if (_renewTimer == null)
-                return;
+                return Task.CompletedTask;
 
             _renewTimer.Dispose();
             _renewTimer = null;
+
+            return Task.CompletedTask;
         }
 
         private async void RenewLeases(object state)

src/providers/WorkflowCore.Providers.Redis/Services/RedisPersistenceProvider.cs

@@ -70,7 +70,7 @@ public async Task<IEnumerable<string>> GetRunnableInstances(DateTime asAt)
             return result;
         }
 
-        public async Task<IEnumerable<WorkflowInstance>> GetWorkflowInstances(WorkflowStatus? status, string type, DateTime? createdFrom, DateTime? createdTo, int skip,
+        public Task<IEnumerable<WorkflowInstance>> GetWorkflowInstances(WorkflowStatus? status, string type, DateTime? createdFrom, DateTime? createdTo, int skip,
             int take)
         {
             throw new NotImplementedException();