Remove unused imports (#2126)

src/Runner.Common/Logging.cs

@@ -1,4 +1,3 @@
-using GitHub.Runner.Common.Util;
 using System;
 using System.IO;
 

src/Runner.Common/ProcessInvoker.cs

@@ -1,4 +1,4 @@
-using GitHub.Runner.Common.Util;
+using GitHub.Runner.Common.Util;
 using GitHub.Runner.Sdk;
 using System;
 using System.Collections.Generic;

src/Runner.Common/RunServer.cs

@@ -1,11 +1,8 @@
-using System;
-using System.Collections.Generic;
-using System.Runtime.Serialization;
+using System;
 using System.Threading;
 using System.Threading.Tasks;
 using GitHub.DistributedTask.Pipelines;
 using GitHub.DistributedTask.WebApi;
-using GitHub.Runner.Common.Util;
 using GitHub.Runner.Sdk;
 using GitHub.Services.Common;
 using GitHub.Services.WebApi;

src/Runner.Common/RunnerServer.cs

@@ -1,9 +1,8 @@
-using GitHub.DistributedTask.WebApi;
+using GitHub.DistributedTask.WebApi;
 using System;
 using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
-using GitHub.Runner.Common.Util;
 using GitHub.Services.WebApi;
 using GitHub.Services.Common;
 using GitHub.Runner.Sdk;

src/Runner.Common/ThrottlingReportHandler.cs

@@ -1,10 +1,9 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
-using GitHub.Runner.Common.Util;
 using GitHub.Runner.Sdk;
 using GitHub.Services.Common.Internal;
 

src/Runner.Common/TraceManager.cs

@@ -1,4 +1,3 @@
-using GitHub.Runner.Common.Util;
 using System;
 using System.Collections.Concurrent;
 using System.Diagnostics;

src/Runner.Common/Tracing.cs

@@ -1,5 +1,3 @@
-
-using GitHub.Runner.Common.Util;
 using Newtonsoft.Json;
 using System;
 using System.Diagnostics;

src/Runner.Common/Util/VarUtil.cs

@@ -1,7 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using GitHub.Runner.Sdk;
+using System;
 
 namespace GitHub.Runner.Common.Util
 {