Fix retry logic for deployment not seeding correctly

config/Services/Seed.cs

@@ -74,13 +74,18 @@ namespace Microsoft.Azure.IoTSolutions.UIConfig.Services
             }
 
             this.log.Info("Seed begin", () => { });
+            try
+            {
                 await this.SeedAsync();
                 this.log.Info("Seed end", () => { });
-
                 await this.SetCompletedFlagAsync();
-
+                this.log.Info("Seed completed flag set", () => { });
+            }
+            finally
+            {
                 await this.mutex.LeaveAsync(SEED_COLLECTION_ID, MUTEX_KEY);
             }
+        }
 
         private async Task<bool> CheckCompletedFlagAsync()
         {