Fix namespaces for code moved to separate class libraries (#263)

* Create ServiceHost a service-specific class

* Renaming hosting namespace

* Rename credentials namespace

* Fix namespaces

src/Microsoft.SqlTools.Hosting/Utility/AsyncContext.cs

@@ -7,7 +7,7 @@ using System;
 using System.Threading;
 using System.Threading.Tasks;
 
-namespace Microsoft.SqlTools.ServiceLayer.Utility
+namespace Microsoft.SqlTools.Utility
 {
     /// <summary>
     /// Simplifies the setup of a SynchronizationContext for the use

src/Microsoft.SqlTools.Hosting/Utility/AsyncContextThread.cs

@@ -7,7 +7,7 @@ using System;
 using System.Threading;
 using System.Threading.Tasks;
 
-namespace Microsoft.SqlTools.ServiceLayer.Utility
+namespace Microsoft.SqlTools.Utility
 {
     /// <summary>
     /// Provides a simplified interface for creating a new thread

src/Microsoft.SqlTools.Hosting/Utility/AsyncLock.cs

@@ -7,7 +7,7 @@ using System;
 using System.Threading;
 using System.Threading.Tasks;
 
-namespace Microsoft.SqlTools.ServiceLayer.Utility
+namespace Microsoft.SqlTools.Utility
 {
     /// <summary>
     /// Provides a simple wrapper over a SemaphoreSlim to allow

src/Microsoft.SqlTools.Hosting/Utility/AsyncQueue.cs

@@ -8,7 +8,7 @@ using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 
-namespace Microsoft.SqlTools.ServiceLayer.Utility
+namespace Microsoft.SqlTools.Utility
 {
     /// <summary>
     /// Provides a synchronized queue which can be used from within async

src/Microsoft.SqlTools.Hosting/Utility/Extensions.cs

@@ -5,7 +5,7 @@
 
 using System;
 
-namespace Microsoft.SqlTools.ServiceLayer.Utility
+namespace Microsoft.SqlTools.Utility
 {
     public static class ObjectExtensions
     {

src/Microsoft.SqlTools.Hosting/Utility/Logger.cs

@@ -9,7 +9,7 @@ using System.IO;
 using System.Runtime.CompilerServices;
 using System.Text;
 
-namespace Microsoft.SqlTools.ServiceLayer.Utility
+namespace Microsoft.SqlTools.Utility
 {
     /// <summary>
     /// Defines the level indicators for log messages.

src/Microsoft.SqlTools.Hosting/Utility/LongList.cs

@@ -7,7 +7,7 @@ using System;
 using System.Collections;
 using System.Collections.Generic;
 
-namespace Microsoft.SqlTools.ServiceLayer.Utility
+namespace Microsoft.SqlTools.Utility
 {
     /// <summary>
     /// Collection class that permits storage of over <c>int.MaxValue</c> items. This is performed

src/Microsoft.SqlTools.Hosting/Utility/TextUtilities.cs

@@ -3,7 +3,7 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
-namespace Microsoft.SqlTools.ServiceLayer.Utility
+namespace Microsoft.SqlTools.Utility
 {
     public static class TextUtilities
     {   

src/Microsoft.SqlTools.Hosting/Utility/ThreadSynchronizationContext.cs

@@ -7,7 +7,7 @@ using System;
 using System.Collections.Concurrent;
 using System.Threading;
 
-namespace Microsoft.SqlTools.ServiceLayer.Utility
+namespace Microsoft.SqlTools.Utility
 {
     /// <summary>
     /// Provides a SynchronizationContext implementation that can be used

src/Microsoft.SqlTools.Hosting/Utility/Validate.cs

@@ -6,7 +6,7 @@
 using System;
 using System.Collections.Generic;
 
-namespace Microsoft.SqlTools.ServiceLayer.Utility
+namespace Microsoft.SqlTools.Utility
 {
     /// <summary>
     /// Provides common validation methods to simplify method