Cleanup - Unwanted usings

Author: ShreyasJejurkar

src/Servers/Connections.Abstractions/src/BaseConnectionContext.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections.Generic;
 using System.Net;
-using System.Net.Sockets;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Http.Features;

src/Servers/Connections.Abstractions/src/DefaultConnectionContext.cs

@@ -5,7 +5,6 @@
 using System.Collections.Generic;
 using System.IO.Pipelines;
 using System.Net;
-using System.Net.Sockets;
 using System.Security.Claims;
 using System.Threading;
 using System.Threading.Tasks;

src/Servers/Kestrel/shared/TransportConnection.FeatureCollection.cs

@@ -4,7 +4,6 @@
 using System.Buffers;
 using System.Collections.Generic;
 using System.IO.Pipelines;
-using System.Net.Sockets;
 using System.Threading;
 using Microsoft.AspNetCore.Connections.Features;
 

src/Servers/Kestrel/shared/TransportConnection.cs

@@ -6,7 +6,6 @@
 using System.Diagnostics;
 using System.IO.Pipelines;
 using System.Net;
-using System.Net.Sockets;
 using System.Threading;
 using Microsoft.AspNetCore.Http.Features;